<article>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#article10_02_05_1622201</id>
	<title>New Most Precise Clock Based On Aluminum Ion</title>
	<author>ScuttleMonkey</author>
	<datestamp>1265390880000</datestamp>
	<htmltext>eldavojohn writes <i>"The National Institute for Standards and Technology has <a href="http://www.nist.gov/public\_affairs/releases/logicclock\_020410.html">unveiled a new clock</a> that will 'neither gain nor lose one second in about 3.7 billion years,' making it an atomic clock twice as precise as the previous pacesetter, which was based on mercury atoms.  Experts call it a 'milestone for atomic clocks.'  The press release describes the workings: 'The logic clock is based on a single aluminum ion (electrically charged atom) trapped by electric fields and vibrating at ultraviolet light frequencies, which are 100,000 times higher than microwave frequencies used in <a href="http://tf.nist.gov/cesium/fountain.htm">NIST-F1</a> and other similar time standards around the world.'  This makes the aluminum ion clock a contender to replace the standard cesium fountain clock (within 1 second in about 100 million years) as NIST's standard.  For those of you asking 'So what?' the article describes the important applications such a device holds: 'The extreme precision offered by optical clocks is already providing record measurements of possible changes in the fundamental "constants" of nature, a line of inquiry that has important implications for cosmology and tests of the laws of physics, such as Einstein's theories of special and general relativity. Next-generation clocks might lead to new types of gravity sensors for exploring underground natural resources and fundamental studies of the Earth. Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.'"</i></htmltext>
<tokenext>eldavojohn writes " The National Institute for Standards and Technology has unveiled a new clock that will 'neither gain nor lose one second in about 3.7 billion years, ' making it an atomic clock twice as precise as the previous pacesetter , which was based on mercury atoms .
Experts call it a 'milestone for atomic clocks .
' The press release describes the workings : 'The logic clock is based on a single aluminum ion ( electrically charged atom ) trapped by electric fields and vibrating at ultraviolet light frequencies , which are 100,000 times higher than microwave frequencies used in NIST-F1 and other similar time standards around the world .
' This makes the aluminum ion clock a contender to replace the standard cesium fountain clock ( within 1 second in about 100 million years ) as NIST 's standard .
For those of you asking 'So what ?
' the article describes the important applications such a device holds : 'The extreme precision offered by optical clocks is already providing record measurements of possible changes in the fundamental " constants " of nature , a line of inquiry that has important implications for cosmology and tests of the laws of physics , such as Einstein 's theories of special and general relativity .
Next-generation clocks might lead to new types of gravity sensors for exploring underground natural resources and fundamental studies of the Earth .
Other possible applications may include ultra-precise autonomous navigation , such as landing planes by GPS .
' "</tokentext>
<sentencetext>eldavojohn writes "The National Institute for Standards and Technology has unveiled a new clock that will 'neither gain nor lose one second in about 3.7 billion years,' making it an atomic clock twice as precise as the previous pacesetter, which was based on mercury atoms.
Experts call it a 'milestone for atomic clocks.
'  The press release describes the workings: 'The logic clock is based on a single aluminum ion (electrically charged atom) trapped by electric fields and vibrating at ultraviolet light frequencies, which are 100,000 times higher than microwave frequencies used in NIST-F1 and other similar time standards around the world.
'  This makes the aluminum ion clock a contender to replace the standard cesium fountain clock (within 1 second in about 100 million years) as NIST's standard.
For those of you asking 'So what?
' the article describes the important applications such a device holds: 'The extreme precision offered by optical clocks is already providing record measurements of possible changes in the fundamental "constants" of nature, a line of inquiry that has important implications for cosmology and tests of the laws of physics, such as Einstein's theories of special and general relativity.
Next-generation clocks might lead to new types of gravity sensors for exploring underground natural resources and fundamental studies of the Earth.
Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.
'"</sentencetext>
</article>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31039218</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>wonglijie</author>
	<datestamp>1265363640000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>We may not have all the answers.. yet. But one day we may. It might be noteworthy that the pace of RnD is progressing exponentially too.</htmltext>
<tokenext>We may not have all the answers.. yet. But one day we may .
It might be noteworthy that the pace of RnD is progressing exponentially too .</tokentext>
<sentencetext>We may not have all the answers.. yet. But one day we may.
It might be noteworthy that the pace of RnD is progressing exponentially too.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036902</id>
	<title>Re:3.7 billion years from now ...</title>
	<author>SnarfQuest</author>
	<datestamp>1265396580000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>And, wouldn't you know it, the clock was off by 1.00037 seconds. What a crappy clock!</p></htmltext>
<tokenext>And , would n't you know it , the clock was off by 1.00037 seconds .
What a crappy clock !</tokentext>
<sentencetext>And, wouldn't you know it, the clock was off by 1.00037 seconds.
What a crappy clock!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036670</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>deglr6328</author>
	<datestamp>1265400240000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>5</modscore>
	<htmltext><p>The long list of lame jokes that would inevitably accompany this article are obvious and unsurprising. But these "oooh now I can get to my next meeting within one yoctosecond of it starting" jokes may be more apt than you realize. There is a real issue of how to even use a clock this accurate at all. This new Al ion clock is supposedly accurate to one part in 10^17, yes? An article I read in SciAm ~8 years ago predicted this milestone would be reached within the decade, and it seems they were right. The problem is, you will introduce a relativistic time dilation to a clock with an accuracy on the order of 1 in 10^17 <b>merely by walking down the street with it</b>. Similarly, you will experience a comparable magnitude of time dilation by reducing the earth's gravity you experience by raising your elevation off the ground by <b>only 10 centimeters</b>. Aside from pure physics experiments like measuring a potential variation in the fine structure constant since the beginning of the universe and such, I don't know how practical application of a clock this accurate could be achieved. For instance, even if you manage to get a time standard of this level accuracy aboard a GPS satellite, you need to know the satellite's location in orbit, it's "ephemeris data", to an equal degree of accuracy in order to make use of such a time standard. Is that even possible? How do you transfer a time standard of such extreme precision between two clocks while preserving its integrity? If that can't be done, what is the practical use of an absolutely stationary clock that can never be moved? Even for the measurement of the fine structure constant at something like 1/10^18, you will have to take into consideration the movement of the continent due to plate tectonics and the movement of magma bubbles in the planet's mantle in order to have confidence in the accuracy of your answer.</p></htmltext>
<tokenext>The long list of lame jokes that would inevitably accompany this article are obvious and unsurprising .
But these " oooh now I can get to my next meeting within one yoctosecond of it starting " jokes may be more apt than you realize .
There is a real issue of how to even use a clock this accurate at all .
This new Al ion clock is supposedly accurate to one part in 10 ^ 17 , yes ?
An article I read in SciAm ~ 8 years ago predicted this milestone would be reached within the decade , and it seems they were right .
The problem is , you will introduce a relativistic time dilation to a clock with an accuracy on the order of 1 in 10 ^ 17 merely by walking down the street with it .
Similarly , you will experience a comparable magnitude of time dilation by reducing the earth 's gravity you experience by raising your elevation off the ground by only 10 centimeters .
Aside from pure physics experiments like measuring a potential variation in the fine structure constant since the beginning of the universe and such , I do n't know how practical application of a clock this accurate could be achieved .
For instance , even if you manage to get a time standard of this level accuracy aboard a GPS satellite , you need to know the satellite 's location in orbit , it 's " ephemeris data " , to an equal degree of accuracy in order to make use of such a time standard .
Is that even possible ?
How do you transfer a time standard of such extreme precision between two clocks while preserving its integrity ?
If that ca n't be done , what is the practical use of an absolutely stationary clock that can never be moved ?
Even for the measurement of the fine structure constant at something like 1/10 ^ 18 , you will have to take into consideration the movement of the continent due to plate tectonics and the movement of magma bubbles in the planet 's mantle in order to have confidence in the accuracy of your answer .</tokentext>
<sentencetext>The long list of lame jokes that would inevitably accompany this article are obvious and unsurprising.
But these "oooh now I can get to my next meeting within one yoctosecond of it starting" jokes may be more apt than you realize.
There is a real issue of how to even use a clock this accurate at all.
This new Al ion clock is supposedly accurate to one part in 10^17, yes?
An article I read in SciAm ~8 years ago predicted this milestone would be reached within the decade, and it seems they were right.
The problem is, you will introduce a relativistic time dilation to a clock with an accuracy on the order of 1 in 10^17 merely by walking down the street with it.
Similarly, you will experience a comparable magnitude of time dilation by reducing the earth's gravity you experience by raising your elevation off the ground by only 10 centimeters.
Aside from pure physics experiments like measuring a potential variation in the fine structure constant since the beginning of the universe and such, I don't know how practical application of a clock this accurate could be achieved.
For instance, even if you manage to get a time standard of this level accuracy aboard a GPS satellite, you need to know the satellite's location in orbit, it's "ephemeris data", to an equal degree of accuracy in order to make use of such a time standard.
Is that even possible?
How do you transfer a time standard of such extreme precision between two clocks while preserving its integrity?
If that can't be done, what is the practical use of an absolutely stationary clock that can never be moved?
Even for the measurement of the fine structure constant at something like 1/10^18, you will have to take into consideration the movement of the continent due to plate tectonics and the movement of magma bubbles in the planet's mantle in order to have confidence in the accuracy of your answer.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036426</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038604</id>
	<title>Re:Plane landings?</title>
	<author>harlows\_monkeys</author>
	<datestamp>1265360880000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>The difference between current atomic clocks and a <i>perfect</i> atomic clock would only result in a fraction of a millimeter in positioning difference, tops.</htmltext>
<tokenext>The difference between current atomic clocks and a perfect atomic clock would only result in a fraction of a millimeter in positioning difference , tops .</tokentext>
<sentencetext>The difference between current atomic clocks and a perfect atomic clock would only result in a fraction of a millimeter in positioning difference, tops.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036864</id>
	<title>People too preoccupied with their clocks!</title>
	<author>Phizzle</author>
	<datestamp>1265396340000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><b>Stop the clock envy, dont be a bunch of clock-blockers dammit!</b></htmltext>
<tokenext>Stop the clock envy , dont be a bunch of clock-blockers dammit !</tokentext>
<sentencetext>Stop the clock envy, dont be a bunch of clock-blockers dammit!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036548</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31042688</id>
	<title>Re:Plane landings?</title>
	<author>Anonymous</author>
	<datestamp>1265385480000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Admiral: Ah, the test on this new autopilot is going great!!!  Outstanding performance, consistency, and accuracy.  Lieutenant!  What time is it?</p><p>Lieutenant: 1453.0000000000000000000000000000000000000000000000000000000000000000000000000000002 hours, sir.</p><p>Admiral: Dear God...  Nooooooooooooooo!!!!!!!!!!!!!</p><p>[massive explosion]</p></htmltext>
<tokenext>Admiral : Ah , the test on this new autopilot is going great ! ! !
Outstanding performance , consistency , and accuracy .
Lieutenant ! What time is it ? Lieutenant : 1453.0000000000000000000000000000000000000000000000000000000000000000000000000000002 hours , sir.Admiral : Dear God.. .
Nooooooooooooooo ! ! ! ! ! ! ! ! ! ! ! ! ! [ massive explosion ]</tokentext>
<sentencetext>Admiral: Ah, the test on this new autopilot is going great!!!
Outstanding performance, consistency, and accuracy.
Lieutenant!  What time is it?Lieutenant: 1453.0000000000000000000000000000000000000000000000000000000000000000000000000000002 hours, sir.Admiral: Dear God...
Nooooooooooooooo!!!!!!!!!!!!![massive explosion]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036576</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037888</id>
	<title>So the old clock...</title>
	<author>Anonymous</author>
	<datestamp>1265401140000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>...was too mercurial?</p></htmltext>
<tokenext>...was too mercurial ?</tokentext>
<sentencetext>...was too mercurial?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31039730</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>maestroX</author>
	<datestamp>1265365980000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><blockquote><div><p>There is a real issue of how to even use a clock this accurate at all.</p></div>
</blockquote><p>
How do you prove the clock is more accurate than the reference clock?</p></div>
	</htmltext>
<tokenext>There is a real issue of how to even use a clock this accurate at all .
How do you prove the clock is more accurate than the reference clock ?</tokentext>
<sentencetext>There is a real issue of how to even use a clock this accurate at all.
How do you prove the clock is more accurate than the reference clock?
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036600</id>
	<title>Sensitivity</title>
	<author>seven of five</author>
	<datestamp>1265395200000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Forget the 3.7 billion year thing. What's important is this thing's accurate to one part in 10^17. Correct me if I'm wrong, but it'll probably run faster or slower depending on how close you stand to the thing.<br> <br>On toppa that, it never needs winding.</htmltext>
<tokenext>Forget the 3.7 billion year thing .
What 's important is this thing 's accurate to one part in 10 ^ 17 .
Correct me if I 'm wrong , but it 'll probably run faster or slower depending on how close you stand to the thing .
On toppa that , it never needs winding .</tokentext>
<sentencetext>Forget the 3.7 billion year thing.
What's important is this thing's accurate to one part in 10^17.
Correct me if I'm wrong, but it'll probably run faster or slower depending on how close you stand to the thing.
On toppa that, it never needs winding.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036768</id>
	<title>Nothing could go wrong, right?</title>
	<author>jack2000</author>
	<datestamp>1265395980000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>A single atom they say? Que random decay in 4 3 2 1<nobr> <wbr></nobr>...</htmltext>
<tokenext>A single atom they say ?
Que random decay in 4 3 2 1 .. .</tokentext>
<sentencetext>A single atom they say?
Que random decay in 4 3 2 1 ...</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037462</id>
	<title>Re:Sensitivity</title>
	<author>orient</author>
	<datestamp>1265399100000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>The more accurate we measure the time, the more accurate we measure the speed. According to Heisenberg, this leads to less accurate info on position. So a perfect clock would create a meltdown around it, wouldn't it?</htmltext>
<tokenext>The more accurate we measure the time , the more accurate we measure the speed .
According to Heisenberg , this leads to less accurate info on position .
So a perfect clock would create a meltdown around it , would n't it ?</tokentext>
<sentencetext>The more accurate we measure the time, the more accurate we measure the speed.
According to Heisenberg, this leads to less accurate info on position.
So a perfect clock would create a meltdown around it, wouldn't it?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036600</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036472</id>
	<title>Assuming We're still around</title>
	<author>Anonymous</author>
	<datestamp>1265394720000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>This kind of assumes that we're around in 3.7 billion years, doesn't it? I think the human ace will probably kill itself before then...</htmltext>
<tokenext>This kind of assumes that we 're around in 3.7 billion years , does n't it ?
I think the human ace will probably kill itself before then.. .</tokentext>
<sentencetext>This kind of assumes that we're around in 3.7 billion years, doesn't it?
I think the human ace will probably kill itself before then...</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31039272</id>
	<title>Re:Can someone explain how...</title>
	<author>mcgrew</author>
	<datestamp>1265363820000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Someone did explain how. Read the comments!</p></htmltext>
<tokenext>Someone did explain how .
Read the comments !</tokentext>
<sentencetext>Someone did explain how.
Read the comments!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036886</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037834</id>
	<title>Re:Single ion?</title>
	<author>Jeng</author>
	<datestamp>1265401020000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I'm really not up on this field of science, but it looks like aluminum is a very stable element so I guess it won't just decay away in a few million years.</p><p><a href="http://www.chemicalelements.com/elements/al.html" title="chemicalelements.com">http://www.chemicalelements.com/elements/al.html</a> [chemicalelements.com]</p><p>Isotope     Half Life<br>Al-26    730000.0 years<br>Al-27    Stable<br>Al-28    2.3 minutes</p></htmltext>
<tokenext>I 'm really not up on this field of science , but it looks like aluminum is a very stable element so I guess it wo n't just decay away in a few million years.http : //www.chemicalelements.com/elements/al.html [ chemicalelements.com ] Isotope Half LifeAl-26 730000.0 yearsAl-27 StableAl-28 2.3 minutes</tokentext>
<sentencetext>I'm really not up on this field of science, but it looks like aluminum is a very stable element so I guess it won't just decay away in a few million years.http://www.chemicalelements.com/elements/al.html [chemicalelements.com]Isotope     Half LifeAl-26    730000.0 yearsAl-27    StableAl-28    2.3 minutes</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036568</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037194</id>
	<title>Re:Plane landings?</title>
	<author>Dynedain</author>
	<datestamp>1265397900000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Funny, <a href="http://tech.slashdot.org/story/10/02/05/1639216/Robotic-Audi-To-Brave-Pikes-Peak-Without-a-Driver" title="slashdot.org">this car</a> [slashdot.org] is already accurate to 2cm using GPS.</p><p>1m in plane landings may be catastrophic, but 2cm certainly is not. And GPS can pinpoint your location, but gives you no information on up-to-date ground conditions. For this, local sensing ability (like radar) will always be necessary.</p></htmltext>
<tokenext>Funny , this car [ slashdot.org ] is already accurate to 2cm using GPS.1m in plane landings may be catastrophic , but 2cm certainly is not .
And GPS can pinpoint your location , but gives you no information on up-to-date ground conditions .
For this , local sensing ability ( like radar ) will always be necessary .</tokentext>
<sentencetext>Funny, this car [slashdot.org] is already accurate to 2cm using GPS.1m in plane landings may be catastrophic, but 2cm certainly is not.
And GPS can pinpoint your location, but gives you no information on up-to-date ground conditions.
For this, local sensing ability (like radar) will always be necessary.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037298</id>
	<title>Ultra precise autonomous navigation</title>
	<author>140Mandak262Jamuna</author>
	<datestamp>1265398320000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.'</p></div><p>As soon as they fix the unintended acceleration and unresponsive braking in earth bound vehicles, they will take the next step, is landing the plane by GPS.</p></div>
	</htmltext>
<tokenext>Other possible applications may include ultra-precise autonomous navigation , such as landing planes by GPS .
'As soon as they fix the unintended acceleration and unresponsive braking in earth bound vehicles , they will take the next step , is landing the plane by GPS .</tokentext>
<sentencetext>Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.
'As soon as they fix the unintended acceleration and unresponsive braking in earth bound vehicles, they will take the next step, is landing the plane by GPS.
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040608</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>TeethWhitener</author>
	<datestamp>1265370180000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Aside from pure physics experiments like measuring a potential variation in the fine structure constant since the beginning of the universe and such, I don't know how practical application of a clock this accurate could be achieved.</p></div><p>
I was thinking maybe for a near-term application you could look for prospecting or seismographic uses of this.  You know, place a widely-spaced array of clocks on a large section of land and use the extreme precision to measure gravitational anomalies.  May tell you something about density changes of material in the Earth.  I dunno; the most obvious application is probably to shoot a few of these into space and look for gravity waves, but if by 'practical application' you mean <i>actually practical</i>, prospecting was the best I could come up with off the top of my head.</p></div>
	</htmltext>
<tokenext>Aside from pure physics experiments like measuring a potential variation in the fine structure constant since the beginning of the universe and such , I do n't know how practical application of a clock this accurate could be achieved .
I was thinking maybe for a near-term application you could look for prospecting or seismographic uses of this .
You know , place a widely-spaced array of clocks on a large section of land and use the extreme precision to measure gravitational anomalies .
May tell you something about density changes of material in the Earth .
I dunno ; the most obvious application is probably to shoot a few of these into space and look for gravity waves , but if by 'practical application ' you mean actually practical , prospecting was the best I could come up with off the top of my head .</tokentext>
<sentencetext>Aside from pure physics experiments like measuring a potential variation in the fine structure constant since the beginning of the universe and such, I don't know how practical application of a clock this accurate could be achieved.
I was thinking maybe for a near-term application you could look for prospecting or seismographic uses of this.
You know, place a widely-spaced array of clocks on a large section of land and use the extreme precision to measure gravitational anomalies.
May tell you something about density changes of material in the Earth.
I dunno; the most obvious application is probably to shoot a few of these into space and look for gravity waves, but if by 'practical application' you mean actually practical, prospecting was the best I could come up with off the top of my head.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037824</id>
	<title>Re:3.7 billion years from now ...</title>
	<author>Anonymous</author>
	<datestamp>1265400960000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p><i>Location: 3.7 billion years from now, early December, Planet Earth</i></p><p>Huh? It's February. You're two months off from your 3.7 billion years description.</p></htmltext>
<tokenext>Location : 3.7 billion years from now , early December , Planet EarthHuh ?
It 's February .
You 're two months off from your 3.7 billion years description .</tokentext>
<sentencetext>Location: 3.7 billion years from now, early December, Planet EarthHuh?
It's February.
You're two months off from your 3.7 billion years description.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036670</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036846</id>
	<title>I Love You!</title>
	<author>Anonymous</author>
	<datestamp>1265396280000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Your love is what keeps me going.<br>My heart beating, my blood flowing.<br>The precious words I yearn to hear.<br>Losing you is the only thing I fear.<br>I have faith god will do us right.<br>We will not give up with out a fight.<br>Together we can conquer it all.<br>Just keep your head up and stand tall.<br>So many others care so deeply for you.<br>Don't get discouraged, you know what to do.<br>Pray to God and keep love inside.<br>You can't lose your almighty pride.<br>Because I love you with all of me.<br>With out you I just can't be.<br>You're in my heart forever, were never apart.<br>Our souls were latched from the start.</p></htmltext>
<tokenext>Your love is what keeps me going.My heart beating , my blood flowing.The precious words I yearn to hear.Losing you is the only thing I fear.I have faith god will do us right.We will not give up with out a fight.Together we can conquer it all.Just keep your head up and stand tall.So many others care so deeply for you.Do n't get discouraged , you know what to do.Pray to God and keep love inside.You ca n't lose your almighty pride.Because I love you with all of me.With out you I just ca n't be.You 're in my heart forever , were never apart.Our souls were latched from the start .</tokentext>
<sentencetext>Your love is what keeps me going.My heart beating, my blood flowing.The precious words I yearn to hear.Losing you is the only thing I fear.I have faith god will do us right.We will not give up with out a fight.Together we can conquer it all.Just keep your head up and stand tall.So many others care so deeply for you.Don't get discouraged, you know what to do.Pray to God and keep love inside.You can't lose your almighty pride.Because I love you with all of me.With out you I just can't be.You're in my heart forever, were never apart.Our souls were latched from the start.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036642</id>
	<title>Real atomic wristwatch</title>
	<author>line-bundle</author>
	<datestamp>1265395440000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>If you just wanted an atomic wristwatch here is the first real atomic wristwatch. Not those fakes which use radio reception</p><p><a href="http://www.leapsecond.com/pages/atomic-bill/" title="leapsecond.com">http://www.leapsecond.com/pages/atomic-bill/</a> [leapsecond.com]</p></htmltext>
<tokenext>If you just wanted an atomic wristwatch here is the first real atomic wristwatch .
Not those fakes which use radio receptionhttp : //www.leapsecond.com/pages/atomic-bill/ [ leapsecond.com ]</tokentext>
<sentencetext>If you just wanted an atomic wristwatch here is the first real atomic wristwatch.
Not those fakes which use radio receptionhttp://www.leapsecond.com/pages/atomic-bill/ [leapsecond.com]</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037378</id>
	<title>Planes can already land with GPS ...</title>
	<author>tkjtkj</author>
	<datestamp>1265398680000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>the author needs a lil update on the capabilities of military-grade GPS :<br>"Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS."   omits one fact: the present accuracy of mil GPS is +/- 1cm<br>easily within the range to accomodate landing on a deck<nobr> <wbr></nobr>..</p></htmltext>
<tokenext>the author needs a lil update on the capabilities of military-grade GPS : " Other possible applications may include ultra-precise autonomous navigation , such as landing planes by GPS .
" omits one fact : the present accuracy of mil GPS is + /- 1cmeasily within the range to accomodate landing on a deck . .</tokentext>
<sentencetext>the author needs a lil update on the capabilities of military-grade GPS :"Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.
"   omits one fact: the present accuracy of mil GPS is +/- 1cmeasily within the range to accomodate landing on a deck ..</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036688</id>
	<title>It's always</title>
	<author>Anonymous</author>
	<datestamp>1265395620000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>5 O'clock somewhere</p></htmltext>
<tokenext>5 O'clock somewhere</tokentext>
<sentencetext>5 O'clock somewhere</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31046560</id>
	<title>Re:Plane landings?</title>
	<author>initialE</author>
	<datestamp>1265481420000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>So what you're saying is, instead of dying from something in a <a href="http://www.imdb.com/title/tt0099423/" title="imdb.com">Bruce Willis movie</a> [imdb.com] changing my altitude, I could be dying from something in a <a href="http://www.imdb.com/title/tt0120347/" title="imdb.com">James Bond movie</a> [imdb.com] changing my altitude?</p></htmltext>
<tokenext>So what you 're saying is , instead of dying from something in a Bruce Willis movie [ imdb.com ] changing my altitude , I could be dying from something in a James Bond movie [ imdb.com ] changing my altitude ?</tokentext>
<sentencetext>So what you're saying is, instead of dying from something in a Bruce Willis movie [imdb.com] changing my altitude, I could be dying from something in a James Bond movie [imdb.com] changing my altitude?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040588</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>ozbird</author>
	<datestamp>1265370060000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>NTP FTW!</htmltext>
<tokenext>NTP FTW !</tokentext>
<sentencetext>NTP FTW!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036426</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038530</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>jmizrahi</author>
	<datestamp>1265360520000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>5</modscore>
	<htmltext>You are absolutely correct, the time measured by such a clock is going to be dependent on general relativistic effects, most prominently by distance from the mean geoid.  However, I fail to understand how you jump from that to concluding that it's useless.  For example, you could use such a clock to make precision measurements of general relativity and test possible extensions.  Moreover, a clock that sensitive should be able to "feel" changes in gravity caused by density fluctuations in the Earth.  This could help find oil deposits, for example.  The summary says as much.
Generally speaking, you NEVER lose by increased precision.  It is true that if your specific application is limited by low precision in some other component, you won't gain by increasing precision somewhere else.  However, that's not the case here.  I'll admit that I don't know enough about GPS and satellites to answer your specific question, but my impression is that they currently ARE limited by time standards.</htmltext>
<tokenext>You are absolutely correct , the time measured by such a clock is going to be dependent on general relativistic effects , most prominently by distance from the mean geoid .
However , I fail to understand how you jump from that to concluding that it 's useless .
For example , you could use such a clock to make precision measurements of general relativity and test possible extensions .
Moreover , a clock that sensitive should be able to " feel " changes in gravity caused by density fluctuations in the Earth .
This could help find oil deposits , for example .
The summary says as much .
Generally speaking , you NEVER lose by increased precision .
It is true that if your specific application is limited by low precision in some other component , you wo n't gain by increasing precision somewhere else .
However , that 's not the case here .
I 'll admit that I do n't know enough about GPS and satellites to answer your specific question , but my impression is that they currently ARE limited by time standards .</tokentext>
<sentencetext>You are absolutely correct, the time measured by such a clock is going to be dependent on general relativistic effects, most prominently by distance from the mean geoid.
However, I fail to understand how you jump from that to concluding that it's useless.
For example, you could use such a clock to make precision measurements of general relativity and test possible extensions.
Moreover, a clock that sensitive should be able to "feel" changes in gravity caused by density fluctuations in the Earth.
This could help find oil deposits, for example.
The summary says as much.
Generally speaking, you NEVER lose by increased precision.
It is true that if your specific application is limited by low precision in some other component, you won't gain by increasing precision somewhere else.
However, that's not the case here.
I'll admit that I don't know enough about GPS and satellites to answer your specific question, but my impression is that they currently ARE limited by time standards.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036886</id>
	<title>Can someone explain how...</title>
	<author>Low Ranked Craig</author>
	<datestamp>1265396460000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>accuracy to 1 second in 100 million years is not adequate for landing a plane via GPS?</htmltext>
<tokenext>accuracy to 1 second in 100 million years is not adequate for landing a plane via GPS ?</tokentext>
<sentencetext>accuracy to 1 second in 100 million years is not adequate for landing a plane via GPS?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036418</id>
	<title>So I guess this means</title>
	<author>twidarkling</author>
	<datestamp>1265394540000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>that I've got very little hope of the clock at work running fast, anymore, eh?</p></htmltext>
<tokenext>that I 've got very little hope of the clock at work running fast , anymore , eh ?</tokentext>
<sentencetext>that I've got very little hope of the clock at work running fast, anymore, eh?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036842</id>
	<title>Re:Plane landings?</title>
	<author>Lumpy</author>
	<datestamp>1265396280000</datestamp>
	<modclass>Redundant</modclass>
	<modscore>1</modscore>
	<htmltext><p>Um no. You can do guidance without a GPS reference that is pretty darn accurate.  In fact, using the various marker transmitters around an airport you can easily detect if you are lined up and on the glide path.</p><p>I remember my IFR training, there is a whole lot of other info for landing an airplane that you have outside a GPS.</p></htmltext>
<tokenext>Um no .
You can do guidance without a GPS reference that is pretty darn accurate .
In fact , using the various marker transmitters around an airport you can easily detect if you are lined up and on the glide path.I remember my IFR training , there is a whole lot of other info for landing an airplane that you have outside a GPS .</tokentext>
<sentencetext>Um no.
You can do guidance without a GPS reference that is pretty darn accurate.
In fact, using the various marker transmitters around an airport you can easily detect if you are lined up and on the glide path.I remember my IFR training, there is a whole lot of other info for landing an airplane that you have outside a GPS.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037020</id>
	<title>Re:feedback loop?</title>
	<author>Anonymous</author>
	<datestamp>1265397240000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Think one step further: would it matter? No, because length is already relative. As long as all meter-rods change for all observers, in all frames, it would not make any difference. For all we now they change five times per minute, there is no way to know.</p></htmltext>
<tokenext>Think one step further : would it matter ?
No , because length is already relative .
As long as all meter-rods change for all observers , in all frames , it would not make any difference .
For all we now they change five times per minute , there is no way to know .</tokentext>
<sentencetext>Think one step further: would it matter?
No, because length is already relative.
As long as all meter-rods change for all observers, in all frames, it would not make any difference.
For all we now they change five times per minute, there is no way to know.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036630</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038650</id>
	<title>One...</title>
	<author>kclittle</author>
	<datestamp>1265361060000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>One al-U-men-ee-um, two al-U-men-ee-um, three al-U-men-ee-um... <br>
Yep, pretty accurate, I'd say!</htmltext>
<tokenext>One al-U-men-ee-um , two al-U-men-ee-um , three al-U-men-ee-um.. . Yep , pretty accurate , I 'd say !</tokentext>
<sentencetext>One al-U-men-ee-um, two al-U-men-ee-um, three al-U-men-ee-um... 
Yep, pretty accurate, I'd say!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31045224</id>
	<title>Much simpler to operate laser interferometers...</title>
	<author>John Hasler</author>
	<datestamp>1265468340000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>...between each pair of your satellites.  Which is, in fact, the <a href="http://en.wikipedia.org/wiki/Laser\_Interferometer\_Space\_Antenna" title="wikipedia.org"> plan</a> [wikipedia.org].</htmltext>
<tokenext>...between each pair of your satellites .
Which is , in fact , the plan [ wikipedia.org ] .</tokentext>
<sentencetext>...between each pair of your satellites.
Which is, in fact, the  plan [wikipedia.org].</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038882</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037740</id>
	<title>miniaturization?</title>
	<author>Anonymous</author>
	<datestamp>1265400540000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>I really wish they would work on miniaturizing some of these things.</p><p>It doesn't have to me one of the 1s in 1 million years units, but I'd like my clocks to stay set (especially if they don't sync to GPS or WWVB). In my kitchen there's the microwave, oven, wall clock, and coffee machine, and they're all slightly off. It'd be nice if they stayed in sync.</p><p>At the very least I wish that  appliance makers would allow me to simply not set the clock at all, as I really don't need it everywhere. While I need a count-down timer in the microwave, I really don't care what time of day it is, as I'm not going to set an alarm on it. Ditto for my stove--especially since I have a kitchen timer.</p></htmltext>
<tokenext>I really wish they would work on miniaturizing some of these things.It does n't have to me one of the 1s in 1 million years units , but I 'd like my clocks to stay set ( especially if they do n't sync to GPS or WWVB ) .
In my kitchen there 's the microwave , oven , wall clock , and coffee machine , and they 're all slightly off .
It 'd be nice if they stayed in sync.At the very least I wish that appliance makers would allow me to simply not set the clock at all , as I really do n't need it everywhere .
While I need a count-down timer in the microwave , I really do n't care what time of day it is , as I 'm not going to set an alarm on it .
Ditto for my stove--especially since I have a kitchen timer .</tokentext>
<sentencetext>I really wish they would work on miniaturizing some of these things.It doesn't have to me one of the 1s in 1 million years units, but I'd like my clocks to stay set (especially if they don't sync to GPS or WWVB).
In my kitchen there's the microwave, oven, wall clock, and coffee machine, and they're all slightly off.
It'd be nice if they stayed in sync.At the very least I wish that  appliance makers would allow me to simply not set the clock at all, as I really don't need it everywhere.
While I need a count-down timer in the microwave, I really don't care what time of day it is, as I'm not going to set an alarm on it.
Ditto for my stove--especially since I have a kitchen timer.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036664</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>nih</author>
	<datestamp>1265395500000</datestamp>
	<modclass>None</modclass>
	<modscore>-1</modscore>
	<htmltext>Its time yous gots a whooping!</htmltext>
<tokenext>Its time yous gots a whooping !</tokentext>
<sentencetext>Its time yous gots a whooping!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036426</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036614</id>
	<title>Don't we already have this?</title>
	<author>TubeSteak</author>
	<datestamp>1265395260000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.'</p></div><p>IIRC, not only do we already have this capability, but they had to design in some wiggle room because the precision touchdowns were hammering runways on the same spot until they started to break.</p></div>
	</htmltext>
<tokenext>Other possible applications may include ultra-precise autonomous navigation , such as landing planes by GPS .
'IIRC , not only do we already have this capability , but they had to design in some wiggle room because the precision touchdowns were hammering runways on the same spot until they started to break .</tokentext>
<sentencetext>Other possible applications may include ultra-precise autonomous navigation, such as landing planes by GPS.
'IIRC, not only do we already have this capability, but they had to design in some wiggle room because the precision touchdowns were hammering runways on the same spot until they started to break.
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037520</id>
	<title>Re:Plane landings?</title>
	<author>mseidl</author>
	<datestamp>1265399460000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>rtkgps <a href="http://en.wikipedia.org/wiki/Real\_Time\_Kinematic" title="wikipedia.org" rel="nofollow">http://en.wikipedia.org/wiki/Real\_Time\_Kinematic</a> [wikipedia.org]

is accurate to 1cm.  So that would help.</htmltext>
<tokenext>rtkgps http : //en.wikipedia.org/wiki/Real \ _Time \ _Kinematic [ wikipedia.org ] is accurate to 1cm .
So that would help .</tokentext>
<sentencetext>rtkgps http://en.wikipedia.org/wiki/Real\_Time\_Kinematic [wikipedia.org]

is accurate to 1cm.
So that would help.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036922</id>
	<title>Re:Plane landings?</title>
	<author>Anonymous</author>
	<datestamp>1265396700000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Since the aluminum ion clock uses ultra violet frequencies to measure time, what happens when the I have this clock on my spaceship traveling at light speed? Does the time drift due to the red/blue shift of the ultra violet rays in my uber clock shift a) forward to say I'm faster than light, b) slow down to the point to tell me that time is standing still or going into the past?</p></htmltext>
<tokenext>Since the aluminum ion clock uses ultra violet frequencies to measure time , what happens when the I have this clock on my spaceship traveling at light speed ?
Does the time drift due to the red/blue shift of the ultra violet rays in my uber clock shift a ) forward to say I 'm faster than light , b ) slow down to the point to tell me that time is standing still or going into the past ?</tokentext>
<sentencetext>Since the aluminum ion clock uses ultra violet frequencies to measure time, what happens when the I have this clock on my spaceship traveling at light speed?
Does the time drift due to the red/blue shift of the ultra violet rays in my uber clock shift a) forward to say I'm faster than light, b) slow down to the point to tell me that time is standing still or going into the past?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037376</id>
	<title>Re:Plane landings?</title>
	<author>Anonymous</author>
	<datestamp>1265398680000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><blockquote><div><p>The kicker of it is that since the satellites are moving at fast speeds</p></div>
</blockquote><p>Or for those of us who don't work in the Department of Redundancy Department, "the satellites are moving <b>fast</b>".</p></div>
	</htmltext>
<tokenext>The kicker of it is that since the satellites are moving at fast speeds Or for those of us who do n't work in the Department of Redundancy Department , " the satellites are moving fast " .</tokentext>
<sentencetext>The kicker of it is that since the satellites are moving at fast speeds
Or for those of us who don't work in the Department of Redundancy Department, "the satellites are moving fast".
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037272</id>
	<title>Re:Plane landings?</title>
	<author>ElSupreme</author>
	<datestamp>1265398200000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Yeah but you get lots of error in transmission losses, and reflections. The clocks are accurate enough, the actual positions of the satelites, and the reflections, and absortions of the signals are what gives you error.</htmltext>
<tokenext>Yeah but you get lots of error in transmission losses , and reflections .
The clocks are accurate enough , the actual positions of the satelites , and the reflections , and absortions of the signals are what gives you error .</tokentext>
<sentencetext>Yeah but you get lots of error in transmission losses, and reflections.
The clocks are accurate enough, the actual positions of the satelites, and the reflections, and absortions of the signals are what gives you error.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038542</id>
	<title>Re:So I guess this means</title>
	<author>alexj33</author>
	<datestamp>1265360580000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext><blockquote><div><p>will 'neither gain nor lose one second in about 3.7 billion years,'</p></div> </blockquote><p>
What clock are they going to check it against to verify its accuracy?
<br> <br>
And if there is such a clock, why isn't that clock being tested instead?</p></div>
	</htmltext>
<tokenext>will 'neither gain nor lose one second in about 3.7 billion years, ' What clock are they going to check it against to verify its accuracy ?
And if there is such a clock , why is n't that clock being tested instead ?</tokentext>
<sentencetext>will 'neither gain nor lose one second in about 3.7 billion years,' 
What clock are they going to check it against to verify its accuracy?
And if there is such a clock, why isn't that clock being tested instead?
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036418</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036630</id>
	<title>feedback loop?</title>
	<author>antimatt</author>
	<datestamp>1265395380000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>The extreme precision offered by optical clocks is already providing record measurements of possible changes in the fundamental "constants" of nature<nobr> <wbr></nobr>...</p></div><p>Hang on. Those bits of matter we're using to determine potential changes to physical constants are governed by physical constants. If every 1-meter rod in the world suddenly became a 1.0001-meter rod while we weren't looking, how would we know?</p></div>
	</htmltext>
<tokenext>The extreme precision offered by optical clocks is already providing record measurements of possible changes in the fundamental " constants " of nature ...Hang on .
Those bits of matter we 're using to determine potential changes to physical constants are governed by physical constants .
If every 1-meter rod in the world suddenly became a 1.0001-meter rod while we were n't looking , how would we know ?</tokentext>
<sentencetext>The extreme precision offered by optical clocks is already providing record measurements of possible changes in the fundamental "constants" of nature ...Hang on.
Those bits of matter we're using to determine potential changes to physical constants are governed by physical constants.
If every 1-meter rod in the world suddenly became a 1.0001-meter rod while we weren't looking, how would we know?
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036996</id>
	<title>Not my fault!</title>
	<author>Hartree</author>
	<datestamp>1265397060000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>It was YOUR aeon to watch the aluminum atom. I did it LAST aeon. It was there safe and sound when I finished!</p></htmltext>
<tokenext>It was YOUR aeon to watch the aluminum atom .
I did it LAST aeon .
It was there safe and sound when I finished !</tokentext>
<sentencetext>It was YOUR aeon to watch the aluminum atom.
I did it LAST aeon.
It was there safe and sound when I finished!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036568</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31043440</id>
	<title>wavelength of light</title>
	<author>Anonymous</author>
	<datestamp>1265393400000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>wavelength of light of a specific frequency wouldnt change</p></htmltext>
<tokenext>wavelength of light of a specific frequency wouldnt change</tokentext>
<sentencetext>wavelength of light of a specific frequency wouldnt change</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036630</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037066</id>
	<title>Good Science and All, but...</title>
	<author>Kozar\_The\_Malignant</author>
	<datestamp>1265397420000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Saying you're keeping precise time with an aluminum clock just doesn't sound as cool as saying you're using a cesium fountain clock.  The proper Mad Science(tm) approach should involve things like ytterbium lasers and liquid helium, not just aluminum.</htmltext>
<tokenext>Saying you 're keeping precise time with an aluminum clock just does n't sound as cool as saying you 're using a cesium fountain clock .
The proper Mad Science ( tm ) approach should involve things like ytterbium lasers and liquid helium , not just aluminum .</tokentext>
<sentencetext>Saying you're keeping precise time with an aluminum clock just doesn't sound as cool as saying you're using a cesium fountain clock.
The proper Mad Science(tm) approach should involve things like ytterbium lasers and liquid helium, not just aluminum.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036442</id>
	<title>Extraordinary claims</title>
	<author>Anonymous</author>
	<datestamp>1265394600000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext><i>The National Institute for Standards and Technology has unveiled a new clock that will 'neither gain nor lose one second in about 3.7 billion years'</i> Sure, they say that now, but just TRY tracking them down to get your money back 3.7 billion years from now when you find out they were lying!</htmltext>
<tokenext>The National Institute for Standards and Technology has unveiled a new clock that will 'neither gain nor lose one second in about 3.7 billion years ' Sure , they say that now , but just TRY tracking them down to get your money back 3.7 billion years from now when you find out they were lying !</tokentext>
<sentencetext>The National Institute for Standards and Technology has unveiled a new clock that will 'neither gain nor lose one second in about 3.7 billion years' Sure, they say that now, but just TRY tracking them down to get your money back 3.7 billion years from now when you find out they were lying!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037482</id>
	<title>Too bad it will only be used for another 461 days</title>
	<author>maddogmiller</author>
	<datestamp>1265399160000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>When Christ comes back, time will cease.  Oh well, it was fun while it lasted.</p></htmltext>
<tokenext>When Christ comes back , time will cease .
Oh well , it was fun while it lasted .</tokentext>
<sentencetext>When Christ comes back, time will cease.
Oh well, it was fun while it lasted.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036918</id>
	<title>Even Better</title>
	<author>causality</author>
	<datestamp>1265396640000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>4</modscore>
	<htmltext><blockquote><div><p>For those of you asking 'So what?' [<nobr> <wbr></nobr>... ]</p></div></blockquote><p>
Do you have any idea how many Slashdot articles could benefit from such an explanation?</p></div>
	</htmltext>
<tokenext>For those of you asking 'So what ?
' [ ... ] Do you have any idea how many Slashdot articles could benefit from such an explanation ?</tokentext>
<sentencetext>For those of you asking 'So what?
' [ ... ]
Do you have any idea how many Slashdot articles could benefit from such an explanation?
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036418</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038084</id>
	<title>Re:Extraordinary claims</title>
	<author>mhajicek</author>
	<datestamp>1265401920000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>But what are you going to compare it to in order to find out?</htmltext>
<tokenext>But what are you going to compare it to in order to find out ?</tokentext>
<sentencetext>But what are you going to compare it to in order to find out?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036442</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037786</id>
	<title>Re:Single ion?</title>
	<author>Sulphur</author>
	<datestamp>1265400780000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Who wants to bet that they lose the aluminum ion before the cesium clock accumulates an error of a millionth second?</p><p>The Al ion was formerly part of Schrodinger's cat.</p></htmltext>
<tokenext>Who wants to bet that they lose the aluminum ion before the cesium clock accumulates an error of a millionth second ? The Al ion was formerly part of Schrodinger 's cat .</tokentext>
<sentencetext>Who wants to bet that they lose the aluminum ion before the cesium clock accumulates an error of a millionth second?The Al ion was formerly part of Schrodinger's cat.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036568</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037580</id>
	<title>Re:Marketing angle</title>
	<author>Anonymous</author>
	<datestamp>1265399760000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Add the fact that only 1 single atom of aluminium is needed per clock<nobr> <wbr></nobr>... well, I think I'll order one, too!</p></htmltext>
<tokenext>Add the fact that only 1 single atom of aluminium is needed per clock ... well , I think I 'll order one , too !</tokentext>
<sentencetext>Add the fact that only 1 single atom of aluminium is needed per clock ... well, I think I'll order one, too!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036548</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037140</id>
	<title>Thank goodness...</title>
	<author>aardwolf64</author>
	<datestamp>1265397720000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I can sleep better knowing that my atomic clock will only lose 1 second in 3.7 billion years instead of 2.  My life has been forever changed.</p></htmltext>
<tokenext>I can sleep better knowing that my atomic clock will only lose 1 second in 3.7 billion years instead of 2 .
My life has been forever changed .</tokentext>
<sentencetext>I can sleep better knowing that my atomic clock will only lose 1 second in 3.7 billion years instead of 2.
My life has been forever changed.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037236</id>
	<title>Re:I'm no genius, but...</title>
	<author>PRMan</author>
	<datestamp>1265398020000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>It's interesting that it's kind of like what the Bible always said about God.</htmltext>
<tokenext>It 's interesting that it 's kind of like what the Bible always said about God .</tokentext>
<sentencetext>It's interesting that it's kind of like what the Bible always said about God.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036872</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038380</id>
	<title>Finally, accurate enough.</title>
	<author>Anonymous</author>
	<datestamp>1265403060000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>General Electric can now get started on the C206 gravity distortion time displacement unit.  I think this is part of the optical system to check the oscillation frequency.  2036, here we come!</htmltext>
<tokenext>General Electric can now get started on the C206 gravity distortion time displacement unit .
I think this is part of the optical system to check the oscillation frequency .
2036 , here we come !</tokentext>
<sentencetext>General Electric can now get started on the C206 gravity distortion time displacement unit.
I think this is part of the optical system to check the oscillation frequency.
2036, here we come!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036568</id>
	<title>Single ion?</title>
	<author>Anonymous</author>
	<datestamp>1265395080000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Who wants to bet that they lose the aluminum ion before the cesium clock accumulates an error of a millionth second?</p></htmltext>
<tokenext>Who wants to bet that they lose the aluminum ion before the cesium clock accumulates an error of a millionth second ?</tokentext>
<sentencetext>Who wants to bet that they lose the aluminum ion before the cesium clock accumulates an error of a millionth second?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036752</id>
	<title>I predict</title>
	<author>Anonymous</author>
	<datestamp>1265395920000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I predict another flood of reference standards to hit e-Bay soon. I've been waiting to find a good (affordable) cesium / rubidium standard for a while now.<nobr> <wbr></nobr>:P</p></htmltext>
<tokenext>I predict another flood of reference standards to hit e-Bay soon .
I 've been waiting to find a good ( affordable ) cesium / rubidium standard for a while now .
: P</tokentext>
<sentencetext>I predict another flood of reference standards to hit e-Bay soon.
I've been waiting to find a good (affordable) cesium / rubidium standard for a while now.
:P</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037324</id>
	<title>Re:Setting it?</title>
	<author>Anonymous</author>
	<datestamp>1265398440000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>They don't, and they don't care.</p><p>There is no absolute time. You can only measure an interval between two points in time. So they switch on this new expensive egg-timer and start counting from that point in time.</p></htmltext>
<tokenext>They do n't , and they do n't care.There is no absolute time .
You can only measure an interval between two points in time .
So they switch on this new expensive egg-timer and start counting from that point in time .</tokentext>
<sentencetext>They don't, and they don't care.There is no absolute time.
You can only measure an interval between two points in time.
So they switch on this new expensive egg-timer and start counting from that point in time.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036764</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037724</id>
	<title>Re:Plane landings?</title>
	<author>mpe</author>
	<datestamp>1265400540000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>4</modscore>
	<htmltext><i>Improving the accuracy of the clocks (by orders of magnitude) has the potential to cut down a few meters to potentially tens of centimeters... You'd need that level of accuracy to land a plane... Planes "flare" during landing (slowing the rate of decent to nearly 0 just as the wheels touch down). Plus or minus even one meter in any direction (up, down, forward, back, side to side) could be catastrophic. So current "autoland" autopilots use radar altitude and ground based ILS (radio based navigation) to gain the necessary precision.</i> <br> <br>"Full blind autoland" systems have been around since the 1960's An unexpected problem with the first systems is that they were "too accurate", runways wear out quickly if touchdown always happens in the same place.<br> <br> <i>If GPS accuracy gets good enough to where you don't need those aux systems (or need them as primary at least), complexity of autopilots would drop significantly...</i> <br> <br>Most landings are performed by pilots. Even in an autoland situation the pilots go through similar procedures to if they were flying the plane. Otherwise things are likely to end up like TK1951.</htmltext>
<tokenext>Improving the accuracy of the clocks ( by orders of magnitude ) has the potential to cut down a few meters to potentially tens of centimeters... You 'd need that level of accuracy to land a plane... Planes " flare " during landing ( slowing the rate of decent to nearly 0 just as the wheels touch down ) .
Plus or minus even one meter in any direction ( up , down , forward , back , side to side ) could be catastrophic .
So current " autoland " autopilots use radar altitude and ground based ILS ( radio based navigation ) to gain the necessary precision .
" Full blind autoland " systems have been around since the 1960 's An unexpected problem with the first systems is that they were " too accurate " , runways wear out quickly if touchdown always happens in the same place .
If GPS accuracy gets good enough to where you do n't need those aux systems ( or need them as primary at least ) , complexity of autopilots would drop significantly... Most landings are performed by pilots .
Even in an autoland situation the pilots go through similar procedures to if they were flying the plane .
Otherwise things are likely to end up like TK1951 .</tokentext>
<sentencetext>Improving the accuracy of the clocks (by orders of magnitude) has the potential to cut down a few meters to potentially tens of centimeters... You'd need that level of accuracy to land a plane... Planes "flare" during landing (slowing the rate of decent to nearly 0 just as the wheels touch down).
Plus or minus even one meter in any direction (up, down, forward, back, side to side) could be catastrophic.
So current "autoland" autopilots use radar altitude and ground based ILS (radio based navigation) to gain the necessary precision.
"Full blind autoland" systems have been around since the 1960's An unexpected problem with the first systems is that they were "too accurate", runways wear out quickly if touchdown always happens in the same place.
If GPS accuracy gets good enough to where you don't need those aux systems (or need them as primary at least), complexity of autopilots would drop significantly...  Most landings are performed by pilots.
Even in an autoland situation the pilots go through similar procedures to if they were flying the plane.
Otherwise things are likely to end up like TK1951.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038540</id>
	<title>Re:Sensitivity</title>
	<author>ZERO1ZERO</author>
	<datestamp>1265360580000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I don't get this. How will it run faster or slower? doesn't it run at a constant rate.?</htmltext>
<tokenext>I do n't get this .
How will it run faster or slower ?
does n't it run at a constant rate .
?</tokentext>
<sentencetext>I don't get this.
How will it run faster or slower?
doesn't it run at a constant rate.
?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036600</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038376</id>
	<title>Head Scratching Time</title>
	<author>Ancient\_Hacker</author>
	<datestamp>1265403060000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I have a serious problem with trying to even imagine how you validate the world's best clock.</p><p>Would you not have to have a better clock to compare it with?</p><p>And how do you know THAT clock is keeping good time?</p><p>And who guarantees that the aluminum ion will always vibrate to that precision?</p><p>Sounds a bit like the old 3-card monte game.</p></htmltext>
<tokenext>I have a serious problem with trying to even imagine how you validate the world 's best clock.Would you not have to have a better clock to compare it with ? And how do you know THAT clock is keeping good time ? And who guarantees that the aluminum ion will always vibrate to that precision ? Sounds a bit like the old 3-card monte game .</tokentext>
<sentencetext>I have a serious problem with trying to even imagine how you validate the world's best clock.Would you not have to have a better clock to compare it with?And how do you know THAT clock is keeping good time?And who guarantees that the aluminum ion will always vibrate to that precision?Sounds a bit like the old 3-card monte game.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036872</id>
	<title>Re:I'm no genius, but...</title>
	<author>spun</author>
	<datestamp>1265396460000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Is time a basic measure of reality, or only an illusion? I mean, time only looks basic from inside. The actual moments that make up a timeline may form backwards, all at once, or randomly, yet from the inside we would still perceive them as happening in a linear fashion, because there are references to the past in each present moment.</p></htmltext>
<tokenext>Is time a basic measure of reality , or only an illusion ?
I mean , time only looks basic from inside .
The actual moments that make up a timeline may form backwards , all at once , or randomly , yet from the inside we would still perceive them as happening in a linear fashion , because there are references to the past in each present moment .</tokentext>
<sentencetext>Is time a basic measure of reality, or only an illusion?
I mean, time only looks basic from inside.
The actual moments that make up a timeline may form backwards, all at once, or randomly, yet from the inside we would still perceive them as happening in a linear fashion, because there are references to the past in each present moment.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036540</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038448</id>
	<title>Re:Plane landings?</title>
	<author>Anonymous</author>
	<datestamp>1265403360000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>the propeller is just a big fan to cool the pilot; you can see that this is true because whenever the propeller stops turning, the pilot starts to sweat...</p><p>for a pilot, 3 good things in life are a good bowel movement, a good orgasm, and a good landing. A night landing on an aircraft carrier is one of those rare occaisions you get to experience all 3 simultaneously</p></htmltext>
<tokenext>the propeller is just a big fan to cool the pilot ; you can see that this is true because whenever the propeller stops turning , the pilot starts to sweat...for a pilot , 3 good things in life are a good bowel movement , a good orgasm , and a good landing .
A night landing on an aircraft carrier is one of those rare occaisions you get to experience all 3 simultaneously</tokentext>
<sentencetext>the propeller is just a big fan to cool the pilot; you can see that this is true because whenever the propeller stops turning, the pilot starts to sweat...for a pilot, 3 good things in life are a good bowel movement, a good orgasm, and a good landing.
A night landing on an aircraft carrier is one of those rare occaisions you get to experience all 3 simultaneously</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036576</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036812</id>
	<title>Well...</title>
	<author>Phizzle</author>
	<datestamp>1265396160000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><b>... its about time! </b></htmltext>
<tokenext>... its about time !</tokentext>
<sentencetext>... its about time! </sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036576</id>
	<title>Plane landings?</title>
	<author>Dynedain</author>
	<datestamp>1265395140000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>4</modscore>
	<htmltext>If you need a clock that's accurate to 8.6 x 10^-19 seconds in order to land a plane, you're probably doing it wrong.</htmltext>
<tokenext>If you need a clock that 's accurate to 8.6 x 10 ^ -19 seconds in order to land a plane , you 're probably doing it wrong .</tokentext>
<sentencetext>If you need a clock that's accurate to 8.6 x 10^-19 seconds in order to land a plane, you're probably doing it wrong.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036764</id>
	<title>Setting it?</title>
	<author>Anonymous</author>
	<datestamp>1265395980000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Ok really curious here: If this new clock is twice as precise as the previous clock... how do they know they've set its time right?</htmltext>
<tokenext>Ok really curious here : If this new clock is twice as precise as the previous clock... how do they know they 've set its time right ?</tokentext>
<sentencetext>Ok really curious here: If this new clock is twice as precise as the previous clock... how do they know they've set its time right?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040492</id>
	<title>And there was much rejoicing...</title>
	<author>Anonymous</author>
	<datestamp>1265369400000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Hooray!</p></htmltext>
<tokenext>Hooray !</tokentext>
<sentencetext>Hooray!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036740</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>Anonymous</author>
	<datestamp>1265395800000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>According to Derek Webb, you never know</p></htmltext>
<tokenext>According to Derek Webb , you never know</tokentext>
<sentencetext>According to Derek Webb, you never know</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036426</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036832</id>
	<title>You're late</title>
	<author>Anonymous</author>
	<datestamp>1265396220000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext><p>You should have been here to welcome us<nobr> <wbr></nobr>.0000000001 seconds ago. Your membership in the Committee to Welcome Our New Overlords has been revoked.</p></htmltext>
<tokenext>You should have been here to welcome us .0000000001 seconds ago .
Your membership in the Committee to Welcome Our New Overlords has been revoked .</tokentext>
<sentencetext>You should have been here to welcome us .0000000001 seconds ago.
Your membership in the Committee to Welcome Our New Overlords has been revoked.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036452</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038906</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>tsotha</author>
	<datestamp>1265362200000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>That's what I was wondering.  With those kinds of relativistic influences emerging as considerations, it seems like they're past the point where additional accuracy provides any sort of real benefit.</htmltext>
<tokenext>That 's what I was wondering .
With those kinds of relativistic influences emerging as considerations , it seems like they 're past the point where additional accuracy provides any sort of real benefit .</tokentext>
<sentencetext>That's what I was wondering.
With those kinds of relativistic influences emerging as considerations, it seems like they're past the point where additional accuracy provides any sort of real benefit.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037602</id>
	<title>100k times higher than microwave frequencies??!!</title>
	<author>Anonymous</author>
	<datestamp>1265399880000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Wow, that's approaching the frequency with which Obama abandons his campaign promises...</p></htmltext>
<tokenext>Wow , that 's approaching the frequency with which Obama abandons his campaign promises.. .</tokentext>
<sentencetext>Wow, that's approaching the frequency with which Obama abandons his campaign promises...</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036442</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037466</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>sabt-pestnu</author>
	<datestamp>1265399100000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Been there, done that.  The critical element of the device fell out.  The only question is, "How long until the <a href="http://en.wikipedia.org/wiki/The\_Hole\_Man" title="wikipedia.org">planet disappears"?</a> [wikipedia.org]</p></htmltext>
<tokenext>Been there , done that .
The critical element of the device fell out .
The only question is , " How long until the planet disappears " ?
[ wikipedia.org ]</tokentext>
<sentencetext>Been there, done that.
The critical element of the device fell out.
The only question is, "How long until the planet disappears"?
[wikipedia.org]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036426</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036992</id>
	<title>Re:3.7 billion years from now ...</title>
	<author>bobdotorg</author>
	<datestamp>1265397060000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><blockquote><div><p>The end is near my friends! A new age will come!"</p></div></blockquote><p>Well, when the atomic \_alarm\_ clock goes off, hitting the snooze button will not be an option.</p></div>
	</htmltext>
<tokenext>The end is near my friends !
A new age will come !
" Well , when the atomic \ _alarm \ _ clock goes off , hitting the snooze button will not be an option .</tokentext>
<sentencetext>The end is near my friends!
A new age will come!
"Well, when the atomic \_alarm\_ clock goes off, hitting the snooze button will not be an option.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036670</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036834</id>
	<title>Drop some science on me</title>
	<author>oldhack</author>
	<datestamp>1265396220000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>How do you measure how precise a clock is?   How do you go about defining the reference for time?</htmltext>
<tokenext>How do you measure how precise a clock is ?
How do you go about defining the reference for time ?</tokentext>
<sentencetext>How do you measure how precise a clock is?
How do you go about defining the reference for time?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036870</id>
	<title>Re:Plane landings?</title>
	<author>Burdell</author>
	<datestamp>1265396400000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>2</modscore>
	<htmltext><p>The relativistic speed means their clocks run slower than clocks sitting still on Earth, according to special relativity.  Another source of GPS time difference is that they are farther away from the center of Earth's gravity than we are, so according to general relativity, their clocks run faster than clocks on Earth.  Both factors have to be taken into account.</p></htmltext>
<tokenext>The relativistic speed means their clocks run slower than clocks sitting still on Earth , according to special relativity .
Another source of GPS time difference is that they are farther away from the center of Earth 's gravity than we are , so according to general relativity , their clocks run faster than clocks on Earth .
Both factors have to be taken into account .</tokentext>
<sentencetext>The relativistic speed means their clocks run slower than clocks sitting still on Earth, according to special relativity.
Another source of GPS time difference is that they are farther away from the center of Earth's gravity than we are, so according to general relativity, their clocks run faster than clocks on Earth.
Both factors have to be taken into account.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036738</id>
	<title>Re:Plane landings?</title>
	<author>ircmaxell</author>
	<datestamp>1265395800000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>5</modscore>
	<htmltext>You need that kind of precision to do it from several hundred miles away (As is what happens with GPS).  The Satellites all have clocks on board that are synchronized and constantly transmit the time.  A GPS receiver simply needs to listen to a few of the satellites, and compute the difference between their times to determine the location.  The kicker of it is that since the satellites are moving at fast speeds (relative to us), the time of their clocks are different from "our" time.  So special relativity is used to counter those relativistic effects.  So basically, GPS is only as accurate as the clocks that form its backbone.  That's one of the reasons why unaugmented GPS is limited in accuracy to a few meters.  Improving the accuracy of the clocks (by orders of magnitude) has the potential to cut down a few meters to potentially tens of centimeters...  You'd need that level of accuracy to land a plane...  Planes "flare" during landing (slowing the rate of decent to nearly 0 just as the wheels touch down).  Plus or minus even one meter in any direction (up, down, forward, back, side to side) could be catastrophic.  So current "autoland" autopilots use radar altitude and ground based ILS (radio based navigation) to gain the necessary precision.  If GPS accuracy gets good enough to where you don't need those aux systems (or need them as primary at least), complexity of autopilots would drop significantly...</htmltext>
<tokenext>You need that kind of precision to do it from several hundred miles away ( As is what happens with GPS ) .
The Satellites all have clocks on board that are synchronized and constantly transmit the time .
A GPS receiver simply needs to listen to a few of the satellites , and compute the difference between their times to determine the location .
The kicker of it is that since the satellites are moving at fast speeds ( relative to us ) , the time of their clocks are different from " our " time .
So special relativity is used to counter those relativistic effects .
So basically , GPS is only as accurate as the clocks that form its backbone .
That 's one of the reasons why unaugmented GPS is limited in accuracy to a few meters .
Improving the accuracy of the clocks ( by orders of magnitude ) has the potential to cut down a few meters to potentially tens of centimeters... You 'd need that level of accuracy to land a plane... Planes " flare " during landing ( slowing the rate of decent to nearly 0 just as the wheels touch down ) .
Plus or minus even one meter in any direction ( up , down , forward , back , side to side ) could be catastrophic .
So current " autoland " autopilots use radar altitude and ground based ILS ( radio based navigation ) to gain the necessary precision .
If GPS accuracy gets good enough to where you do n't need those aux systems ( or need them as primary at least ) , complexity of autopilots would drop significantly.. .</tokentext>
<sentencetext>You need that kind of precision to do it from several hundred miles away (As is what happens with GPS).
The Satellites all have clocks on board that are synchronized and constantly transmit the time.
A GPS receiver simply needs to listen to a few of the satellites, and compute the difference between their times to determine the location.
The kicker of it is that since the satellites are moving at fast speeds (relative to us), the time of their clocks are different from "our" time.
So special relativity is used to counter those relativistic effects.
So basically, GPS is only as accurate as the clocks that form its backbone.
That's one of the reasons why unaugmented GPS is limited in accuracy to a few meters.
Improving the accuracy of the clocks (by orders of magnitude) has the potential to cut down a few meters to potentially tens of centimeters...  You'd need that level of accuracy to land a plane...  Planes "flare" during landing (slowing the rate of decent to nearly 0 just as the wheels touch down).
Plus or minus even one meter in any direction (up, down, forward, back, side to side) could be catastrophic.
So current "autoland" autopilots use radar altitude and ground based ILS (radio based navigation) to gain the necessary precision.
If GPS accuracy gets good enough to where you don't need those aux systems (or need them as primary at least), complexity of autopilots would drop significantly...</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036576</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037124</id>
	<title>Re:Extraordinary claims</title>
	<author>Anonymous</author>
	<datestamp>1265397660000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><blockquote><div><p>but just TRY tracking them down to get your money back 3.7 billion years from now when you find out they were lying!</p></div></blockquote><p>If they were lying, then presumably you'd be aware of it <i>before</i> the 3.7 billion years had passed.</p></div>
	</htmltext>
<tokenext>but just TRY tracking them down to get your money back 3.7 billion years from now when you find out they were lying ! If they were lying , then presumably you 'd be aware of it before the 3.7 billion years had passed .</tokentext>
<sentencetext>but just TRY tracking them down to get your money back 3.7 billion years from now when you find out they were lying!If they were lying, then presumably you'd be aware of it before the 3.7 billion years had passed.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036442</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036574</id>
	<title>It's about time</title>
	<author>Anonymous</author>
	<datestamp>1265395140000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext>Well this is money well spent.  I mean, having to correct my clock every 100 million years was becoming just too laborious.</htmltext>
<tokenext>Well this is money well spent .
I mean , having to correct my clock every 100 million years was becoming just too laborious .</tokentext>
<sentencetext>Well this is money well spent.
I mean, having to correct my clock every 100 million years was becoming just too laborious.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036452</id>
	<title>I, for one,</title>
	<author>Anonymous</author>
	<datestamp>1265394660000</datestamp>
	<modclass>Offtopic</modclass>
	<modscore>-1</modscore>
	<htmltext><p>Welcome our new overly-precise timekeeping overlords.</p></htmltext>
<tokenext>Welcome our new overly-precise timekeeping overlords .</tokentext>
<sentencetext>Welcome our new overly-precise timekeeping overlords.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040620</id>
	<title>The Star Trek Fanatic version</title>
	<author>sacrilicious</author>
	<datestamp>1265370240000</datestamp>
	<modclass>None</modclass>
	<modscore>2</modscore>
	<htmltext><p>"My god... transparent... ALUMINUM?"<br>"No no, this is *timekeeping* aluminum.  You see, it consists of an incredibly preci-"<br>"Traaaaaansparent aluminum... amazing."</p></htmltext>
<tokenext>" My god... transparent... ALUMINUM ?
" " No no , this is * timekeeping * aluminum .
You see , it consists of an incredibly preci- " " Traaaaaansparent aluminum.. .
amazing. "</tokentext>
<sentencetext>"My god... transparent... ALUMINUM?
""No no, this is *timekeeping* aluminum.
You see, it consists of an incredibly preci-""Traaaaaansparent aluminum...
amazing."</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036588</id>
	<title>Aww shoot, he is on H1B</title>
	<author>Anonymous</author>
	<datestamp>1265395140000</datestamp>
	<modclass>Troll</modclass>
	<modscore>0</modscore>
	<htmltext>"NIST postdoctoral researcher James
Chin-wen Chou" How come no one is bitching about American jobs and H1B.</htmltext>
<tokenext>" NIST postdoctoral researcher James Chin-wen Chou " How come no one is bitching about American jobs and H1B .</tokentext>
<sentencetext>"NIST postdoctoral researcher James
Chin-wen Chou" How come no one is bitching about American jobs and H1B.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31039058</id>
	<title>It doesn't matter ...</title>
	<author>woody.jesus</author>
	<datestamp>1265362920000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>... how accurate they get the clocks, the Amtrak train will still be late.</htmltext>
<tokenext>... how accurate they get the clocks , the Amtrak train will still be late .</tokentext>
<sentencetext>... how accurate they get the clocks, the Amtrak train will still be late.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036540</id>
	<title>I'm no genius, but...</title>
	<author>N1tr0u5</author>
	<datestamp>1265394960000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I imagine that being able to measure one of the basic elements of reality, time, in a more precise manner is a great boon.  Wouldn't this be akin to finding out how to measure much smaller spaces?  Great!</htmltext>
<tokenext>I imagine that being able to measure one of the basic elements of reality , time , in a more precise manner is a great boon .
Would n't this be akin to finding out how to measure much smaller spaces ?
Great !</tokentext>
<sentencetext>I imagine that being able to measure one of the basic elements of reality, time, in a more precise manner is a great boon.
Wouldn't this be akin to finding out how to measure much smaller spaces?
Great!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31042350</id>
	<title>Re:It's about time</title>
	<author>ian\_from\_brisbane</author>
	<datestamp>1265382240000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p><div class="quote"><p>It's about time</p></div><p>Best. Article summary. Ever.</p></div>
	</htmltext>
<tokenext>It 's about timeBest .
Article summary .
Ever .</tokentext>
<sentencetext>It's about timeBest.
Article summary.
Ever.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036574</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038882</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>Anonymous</author>
	<datestamp>1265362140000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>5</modscore>
	<htmltext><p>Allright then - you take twelve of these clocks, grouped into clusters of three, arranged in the shape of 3D right angle with each cluster as far away from the other as possible. You isolate them as well as you can, so that they are not disturbed by local vibration and other such things. Probably the best thing to do would be to launch them into space.</p><p>Then you measure their time differences.</p><p>If there's any differences, assuming you've isolated them well enough and are filtering out the expected noise, those differences <i>must</i> be due to external gravity waves.</p><p>Tadaa, we've got a gravity wave antenna. Maybe someone's talking in that spectrum.</p></htmltext>
<tokenext>Allright then - you take twelve of these clocks , grouped into clusters of three , arranged in the shape of 3D right angle with each cluster as far away from the other as possible .
You isolate them as well as you can , so that they are not disturbed by local vibration and other such things .
Probably the best thing to do would be to launch them into space.Then you measure their time differences.If there 's any differences , assuming you 've isolated them well enough and are filtering out the expected noise , those differences must be due to external gravity waves.Tadaa , we 've got a gravity wave antenna .
Maybe someone 's talking in that spectrum .</tokentext>
<sentencetext>Allright then - you take twelve of these clocks, grouped into clusters of three, arranged in the shape of 3D right angle with each cluster as far away from the other as possible.
You isolate them as well as you can, so that they are not disturbed by local vibration and other such things.
Probably the best thing to do would be to launch them into space.Then you measure their time differences.If there's any differences, assuming you've isolated them well enough and are filtering out the expected noise, those differences must be due to external gravity waves.Tadaa, we've got a gravity wave antenna.
Maybe someone's talking in that spectrum.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040148</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>Bengie</author>
	<datestamp>1265367840000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>that's the idea. time dilation is very useful in lots of math. Like the other guy said, link two satellites together via a laser and measure the difference in dilation as they pass over different parts of the earth. lots of other useful things to.</p></htmltext>
<tokenext>that 's the idea .
time dilation is very useful in lots of math .
Like the other guy said , link two satellites together via a laser and measure the difference in dilation as they pass over different parts of the earth .
lots of other useful things to .</tokentext>
<sentencetext>that's the idea.
time dilation is very useful in lots of math.
Like the other guy said, link two satellites together via a laser and measure the difference in dilation as they pass over different parts of the earth.
lots of other useful things to.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31042742</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>jd</author>
	<datestamp>1265386080000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I'd go for a tetrahedral organization myself. You'd need more of these clocks, sure, but you've a better chance of filtering out the noise that is still going to be present.</p><p>Noise source 1: Space expands, but it doesn't do so uniformly on a scale that would be practical for your experiment. If it was uniform, you could eliminate the relativistic effect easily.</p><p>Noise source 2: Space isn't of uniform density. The biggest problem will be localized variations in the solar wind, but the gas streaming off planets, space dust, and other such irritants, will give you gravitational fluctuations. For that matter, so will the orbits of planets. If you can plot these, you can computationally eliminate them.</p><p>Noise source 3: Chaos Theory. Can't avoid this one. James Gleik's book "Chaos" demonstrates the problem when he talks about a billiard ball bouncing off the cushions on the table. If the only perturbations to the trajectory are the bounces and gravitational fields, if a ball travels far enough to bounce seven times then the orbits of asteroids around Alpha Centuri would need to be considered to determine the final resting point.</p><p>The idea of collecting far more data than you strictly need is that you can apply error-correction methods to reduce or eliminate the errors that have been introduced by the noise.</p></htmltext>
<tokenext>I 'd go for a tetrahedral organization myself .
You 'd need more of these clocks , sure , but you 've a better chance of filtering out the noise that is still going to be present.Noise source 1 : Space expands , but it does n't do so uniformly on a scale that would be practical for your experiment .
If it was uniform , you could eliminate the relativistic effect easily.Noise source 2 : Space is n't of uniform density .
The biggest problem will be localized variations in the solar wind , but the gas streaming off planets , space dust , and other such irritants , will give you gravitational fluctuations .
For that matter , so will the orbits of planets .
If you can plot these , you can computationally eliminate them.Noise source 3 : Chaos Theory .
Ca n't avoid this one .
James Gleik 's book " Chaos " demonstrates the problem when he talks about a billiard ball bouncing off the cushions on the table .
If the only perturbations to the trajectory are the bounces and gravitational fields , if a ball travels far enough to bounce seven times then the orbits of asteroids around Alpha Centuri would need to be considered to determine the final resting point.The idea of collecting far more data than you strictly need is that you can apply error-correction methods to reduce or eliminate the errors that have been introduced by the noise .</tokentext>
<sentencetext>I'd go for a tetrahedral organization myself.
You'd need more of these clocks, sure, but you've a better chance of filtering out the noise that is still going to be present.Noise source 1: Space expands, but it doesn't do so uniformly on a scale that would be practical for your experiment.
If it was uniform, you could eliminate the relativistic effect easily.Noise source 2: Space isn't of uniform density.
The biggest problem will be localized variations in the solar wind, but the gas streaming off planets, space dust, and other such irritants, will give you gravitational fluctuations.
For that matter, so will the orbits of planets.
If you can plot these, you can computationally eliminate them.Noise source 3: Chaos Theory.
Can't avoid this one.
James Gleik's book "Chaos" demonstrates the problem when he talks about a billiard ball bouncing off the cushions on the table.
If the only perturbations to the trajectory are the bounces and gravitational fields, if a ball travels far enough to bounce seven times then the orbits of asteroids around Alpha Centuri would need to be considered to determine the final resting point.The idea of collecting far more data than you strictly need is that you can apply error-correction methods to reduce or eliminate the errors that have been introduced by the noise.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038882</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037034</id>
	<title>Re:Plane landings?</title>
	<author>Eternauta3k</author>
	<datestamp>1265397300000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I, for one, want my planes landed to a <a href="http://www.google.com.ar/search?sourceid=chrome&amp;ie=UTF-8&amp;q=8.6+x+10\%5E-19+seconds+*+c" title="google.com.ar">quarter of a nanometer</a> [google.com.ar]</htmltext>
<tokenext>I , for one , want my planes landed to a quarter of a nanometer [ google.com.ar ]</tokentext>
<sentencetext>I, for one, want my planes landed to a quarter of a nanometer [google.com.ar]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036576</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036548</id>
	<title>Marketing angle</title>
	<author>sakdoctor</author>
	<datestamp>1265395020000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext><p>For the domestic market they can use the marketing angle that aluminium is safer than mercury, and that it will case less pollution when you come to trade it in.</p><p>In fact, I think I'll order one now.</p></htmltext>
<tokenext>For the domestic market they can use the marketing angle that aluminium is safer than mercury , and that it will case less pollution when you come to trade it in.In fact , I think I 'll order one now .</tokentext>
<sentencetext>For the domestic market they can use the marketing angle that aluminium is safer than mercury, and that it will case less pollution when you come to trade it in.In fact, I think I'll order one now.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036670</id>
	<title>3.7 billion years from now ...</title>
	<author>Anonymous</author>
	<datestamp>1265395560000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext><p><div class="quote"><p>neither gain nor lose one second in about 3.7 billion years</p></div><p>Location: 3.7 billion years from now, early December, Planet Earth</p><p>Doomsayer: "The ancient "Scientific Community" civilization was so certain a great cataclysm would come in the following months based on their long-lost primitive yet poweful and mythical calculations that they even deemed unnecessary to keep track of time correctly starting this age!  The end is near my friends!  A new age will come!"</p></div>
	</htmltext>
<tokenext>neither gain nor lose one second in about 3.7 billion yearsLocation : 3.7 billion years from now , early December , Planet EarthDoomsayer : " The ancient " Scientific Community " civilization was so certain a great cataclysm would come in the following months based on their long-lost primitive yet poweful and mythical calculations that they even deemed unnecessary to keep track of time correctly starting this age !
The end is near my friends !
A new age will come !
"</tokentext>
<sentencetext>neither gain nor lose one second in about 3.7 billion yearsLocation: 3.7 billion years from now, early December, Planet EarthDoomsayer: "The ancient "Scientific Community" civilization was so certain a great cataclysm would come in the following months based on their long-lost primitive yet poweful and mythical calculations that they even deemed unnecessary to keep track of time correctly starting this age!
The end is near my friends!
A new age will come!
"
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31039698</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>Anonymous</author>
	<datestamp>1265365860000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>1</modscore>
	<htmltext><p>I think you miss the point of accurate clocks.  Everything you have said is exactly why we need such accurate clocks.  The accuracy of GPS is not due to the accuracy of a single clock.  It comes about by comparing clocks on different satellites.  It is those relative differences that allow you to measure distance or changes in the fine structure constant, or whatever else you want to measure.  Let's say we can get one of these clocks on a GPS satellite.  How will we know the exact orbit?  By comparing it to a stationary clock.  That will tell us its altitude.  Then we use the clock on the satellite to compare against other clocks on other satellites.  The worse every clock in that chain is, the worse our overall results are.  The better every clock in that chain is, the better.  Yeah, the whole point of accurate clocks is so that you can compare them so that you can measure all of the things you are worried about.</p></htmltext>
<tokenext>I think you miss the point of accurate clocks .
Everything you have said is exactly why we need such accurate clocks .
The accuracy of GPS is not due to the accuracy of a single clock .
It comes about by comparing clocks on different satellites .
It is those relative differences that allow you to measure distance or changes in the fine structure constant , or whatever else you want to measure .
Let 's say we can get one of these clocks on a GPS satellite .
How will we know the exact orbit ?
By comparing it to a stationary clock .
That will tell us its altitude .
Then we use the clock on the satellite to compare against other clocks on other satellites .
The worse every clock in that chain is , the worse our overall results are .
The better every clock in that chain is , the better .
Yeah , the whole point of accurate clocks is so that you can compare them so that you can measure all of the things you are worried about .</tokentext>
<sentencetext>I think you miss the point of accurate clocks.
Everything you have said is exactly why we need such accurate clocks.
The accuracy of GPS is not due to the accuracy of a single clock.
It comes about by comparing clocks on different satellites.
It is those relative differences that allow you to measure distance or changes in the fine structure constant, or whatever else you want to measure.
Let's say we can get one of these clocks on a GPS satellite.
How will we know the exact orbit?
By comparing it to a stationary clock.
That will tell us its altitude.
Then we use the clock on the satellite to compare against other clocks on other satellites.
The worse every clock in that chain is, the worse our overall results are.
The better every clock in that chain is, the better.
Yeah, the whole point of accurate clocks is so that you can compare them so that you can measure all of the things you are worried about.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036794</id>
	<title>Re:Plane landings?</title>
	<author>Anonymous</author>
	<datestamp>1265396100000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>TFS said something about autonomous plane landing with GPS (not getting into the specifics of why that would be needed, but let's just assume that the communication between the pilot and the control tower is broken or something, and the visibility is too low to allow ground crew to signal the landing strip to the pilot without endangering their lives).</p><p>The GPS has to have very accurate time in order for the coordinates returned by triangulation to be accurate. Drift is very critical here. You don't want a GPS satellite drifting the triangulation so much that the pilot lands on a city.</p><p>Disclaimer: I am not an aviator, and I do not know the complete specifics of GPS triangulation when even the altitude is an unknown factor. I do know that it makes triangulation less precise than on land, where it's precise to the dozen of meters in most circumstances.</p></htmltext>
<tokenext>TFS said something about autonomous plane landing with GPS ( not getting into the specifics of why that would be needed , but let 's just assume that the communication between the pilot and the control tower is broken or something , and the visibility is too low to allow ground crew to signal the landing strip to the pilot without endangering their lives ) .The GPS has to have very accurate time in order for the coordinates returned by triangulation to be accurate .
Drift is very critical here .
You do n't want a GPS satellite drifting the triangulation so much that the pilot lands on a city.Disclaimer : I am not an aviator , and I do not know the complete specifics of GPS triangulation when even the altitude is an unknown factor .
I do know that it makes triangulation less precise than on land , where it 's precise to the dozen of meters in most circumstances .</tokentext>
<sentencetext>TFS said something about autonomous plane landing with GPS (not getting into the specifics of why that would be needed, but let's just assume that the communication between the pilot and the control tower is broken or something, and the visibility is too low to allow ground crew to signal the landing strip to the pilot without endangering their lives).The GPS has to have very accurate time in order for the coordinates returned by triangulation to be accurate.
Drift is very critical here.
You don't want a GPS satellite drifting the triangulation so much that the pilot lands on a city.Disclaimer: I am not an aviator, and I do not know the complete specifics of GPS triangulation when even the altitude is an unknown factor.
I do know that it makes triangulation less precise than on land, where it's precise to the dozen of meters in most circumstances.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036576</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036426</id>
	<title>Ah, I unplugged the atomic clock...</title>
	<author>Anonymous</author>
	<datestamp>1265394600000</datestamp>
	<modclass>Funny</modclass>
	<modscore>2</modscore>
	<htmltext><p>I unplugged the atomic clock by mistake. I was just brooming around and I knocked out this here plug.  Anyone know what time it is?</p></htmltext>
<tokenext>I unplugged the atomic clock by mistake .
I was just brooming around and I knocked out this here plug .
Anyone know what time it is ?</tokentext>
<sentencetext>I unplugged the atomic clock by mistake.
I was just brooming around and I knocked out this here plug.
Anyone know what time it is?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040862</id>
	<title>Re:So I guess this means</title>
	<author>ultranova</author>
	<datestamp>1265371680000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><blockquote><div><p>What clock are they going to check it against to verify its accuracy?</p></div> </blockquote><p>Another aliminum clock, I'd imagine. Fire up a bunch of them and see how much their readings deviate after some time (measured as the median of their readings).</p></div>
	</htmltext>
<tokenext>What clock are they going to check it against to verify its accuracy ?
Another aliminum clock , I 'd imagine .
Fire up a bunch of them and see how much their readings deviate after some time ( measured as the median of their readings ) .</tokentext>
<sentencetext>What clock are they going to check it against to verify its accuracy?
Another aliminum clock, I'd imagine.
Fire up a bunch of them and see how much their readings deviate after some time (measured as the median of their readings).
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038542</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036644</id>
	<title>Useful for deep-space navigation?</title>
	<author>jpedlow</author>
	<datestamp>1265395440000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Would this be useful for things like XNAV? <a href="http://en.wikipedia.org/wiki/XNAV" title="wikipedia.org" rel="nofollow">http://en.wikipedia.org/wiki/XNAV</a> [wikipedia.org]
<p>I could forsee it being handy for things like deep-space navigation. And THAT would be extremely interesting!
</p><p>For making ultra precise time and distance calculations? I guess when you're talking several thousand AU or even lightyears, if we can get a clock to such precision, then we would be able to hopefully narrow down accuracy of such systems to say....a few meters in a lightyear? (just as an example, probably more like a few meters in an AU, but I havent done the math)
</p><p>Ofcourse, I'm not well versed in such things, I'm sure someone with more knowledge than me about this could readily correct me.<nobr> <wbr></nobr>:)</p></htmltext>
<tokenext>Would this be useful for things like XNAV ?
http : //en.wikipedia.org/wiki/XNAV [ wikipedia.org ] I could forsee it being handy for things like deep-space navigation .
And THAT would be extremely interesting !
For making ultra precise time and distance calculations ?
I guess when you 're talking several thousand AU or even lightyears , if we can get a clock to such precision , then we would be able to hopefully narrow down accuracy of such systems to say....a few meters in a lightyear ?
( just as an example , probably more like a few meters in an AU , but I havent done the math ) Ofcourse , I 'm not well versed in such things , I 'm sure someone with more knowledge than me about this could readily correct me .
: )</tokentext>
<sentencetext>Would this be useful for things like XNAV?
http://en.wikipedia.org/wiki/XNAV [wikipedia.org]
I could forsee it being handy for things like deep-space navigation.
And THAT would be extremely interesting!
For making ultra precise time and distance calculations?
I guess when you're talking several thousand AU or even lightyears, if we can get a clock to such precision, then we would be able to hopefully narrow down accuracy of such systems to say....a few meters in a lightyear?
(just as an example, probably more like a few meters in an AU, but I havent done the math)
Ofcourse, I'm not well versed in such things, I'm sure someone with more knowledge than me about this could readily correct me.
:)</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036726</id>
	<title>Oblig.</title>
	<author>Anonymous</author>
	<datestamp>1265395740000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p><nobr> <wbr></nobr></p><div class="quote"><p>...possible changes in the fundamental "constants" of nature, a line of inquiry that has important implications for cosmology and tests of the laws of physics...</p></div><p>"Ye canna change the laws of physics, Cap'n"</p></div>
	</htmltext>
<tokenext>...possible changes in the fundamental " constants " of nature , a line of inquiry that has important implications for cosmology and tests of the laws of physics... " Ye canna change the laws of physics , Cap'n "</tokentext>
<sentencetext> ...possible changes in the fundamental "constants" of nature, a line of inquiry that has important implications for cosmology and tests of the laws of physics..."Ye canna change the laws of physics, Cap'n"
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31043602</id>
	<title>Re:Ah, I unplugged the atomic clock...</title>
	<author>calidoscope</author>
	<datestamp>1265395920000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>As others have mentioned, sounds like a neat way of making a new gravity meter or gravity gradiometer. The gradiometer would probably be more interesting as gravity meters good for sensing a 1 centimeter change in elevation already exist. <p>

FWIW, I worked with some of the people who were involved with the gravity gradiometer work at the Univ of West Oz.</p></htmltext>
<tokenext>As others have mentioned , sounds like a neat way of making a new gravity meter or gravity gradiometer .
The gradiometer would probably be more interesting as gravity meters good for sensing a 1 centimeter change in elevation already exist .
FWIW , I worked with some of the people who were involved with the gravity gradiometer work at the Univ of West Oz .</tokentext>
<sentencetext>As others have mentioned, sounds like a neat way of making a new gravity meter or gravity gradiometer.
The gradiometer would probably be more interesting as gravity meters good for sensing a 1 centimeter change in elevation already exist.
FWIW, I worked with some of the people who were involved with the gravity gradiometer work at the Univ of West Oz.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037678</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31041036</id>
	<title>Vibrating?</title>
	<author>IceFoot</author>
	<datestamp>1265372760000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><i>The logic clock is based on a single aluminum ion<nobr> <wbr></nobr>... vibrating at ultraviolet light frequencies....</i></p><p>Vibrating?  Heh.  Aluminum ions don't vibrate.  Silly science reporters.</p></htmltext>
<tokenext>The logic clock is based on a single aluminum ion ... vibrating at ultraviolet light frequencies....Vibrating ?
Heh. Aluminum ions do n't vibrate .
Silly science reporters .</tokentext>
<sentencetext>The logic clock is based on a single aluminum ion ... vibrating at ultraviolet light frequencies....Vibrating?
Heh.  Aluminum ions don't vibrate.
Silly science reporters.</sentencetext>
</comment>
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--http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037724
--http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036922
--http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037272
-http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038448
</commentlist>
</conversation>
<conversation>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#conversation10_02_05_1622201.17</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036588
</commentlist>
</conversation>
<conversation>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#conversation10_02_05_1622201.4</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036418
-http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31038542
--http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31040862
-http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036918
</commentlist>
</conversation>
<conversation>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#conversation10_02_05_1622201.15</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036548
-http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31037580
-http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036864
</commentlist>
</conversation>
<conversation>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#conversation10_02_05_1622201.2</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036452
-http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036832
</commentlist>
</conversation>
<conversation>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#conversation10_02_05_1622201.18</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_02_05_1622201.31036768
</commentlist>
</conversation>
