- Philex Atomic Clock
- Posted by Bill Blanton on June 30th, 2003
They're sending a cesium atomic clock into space, which
will be more even exact!
Primary Atomic Reference Clock in Space (PARCS)
http://www.boulder.nist.gov/timefreq/cesium/parcs.htm
"The microgravity environment of space allows slowing of atoms to speeds
well below those used in terrestrial atomic clocks, providing for substantial
improvement in clock accuracy. "
Interesting site.Thanks for the link. I found their software and source code
to the programs here-
ftp://time-a.nist.gov/pub/daytime/
"Kath" <kath@youneedtoaskme.co.uk> wrote in message news:udxJGjjPDHA.2052@TK2MSFTNGP11.phx.gbl...
- Posted by Bill Blanton on July 1st, 2003
more even, or even more, depending.
"Bill Blanton" <bblanton@REMOVEmagicnet.net> wrote in message news:#WLI1tvPDHA.3144@tk2msftngp13.phx.gbl...
- Posted by heirloom on July 1st, 2003
How do they determine if it is "off"? If this is supposed to be the most
accurate, by what standard are they checking it ?
Heirloom, old and my Timex works just fine
"Bill Blanton" <bblanton@REMOVEmagicnet.net> wrote in message
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- Posted by Gary S. Terhune on July 1st, 2003
http://whyfiles.org/078time/2.html
Cool!
--
Gary S. Terhune
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"heirloom" <heirloom@nospamatall.com> wrote in message
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- Posted by Gary S. Terhune on July 1st, 2003
S'pose it wouldn't hurt to cite the pertinent part of the article:
"Just curious: How do you judge the accuracy of the most accurate clock in the
world? It might be kinda boring, watching the dial for 6 million years, waiting
for it to lose a second, and you couldn't exactly compare the clock to that
Rolex you bought in Hong Kong. In fact, all those lofty error rates are not
based on observation but rather on calculations reflecting physicists'
understanding of the errors remaining. "Scientists are capable of evaluating the
clocks and predicting error all by themselves, without referring it to something
more accurate," says Collier Smith, a public affairs specialist at NIST. "By
going back to first principles, they can determine what the uncertainties are."
Having forgotten to score a Rolex on our last trip to Hong Kong, we'll take him
at his word."
From: http://whyfiles.org/078time/2.html
--
Gary S. Terhune
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"Gary S. Terhune" <grystnews@mvps.org> wrote in message
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- Posted by Bill Blanton on July 1st, 2003
http://ad.usno.navy.mil/wds/history/markowitz.html
<quote>
Markowitz directed the Time Service Department during a period with
increasing demands for more uniform and accurate time. "Ephemeris Time,"
based on the orbital motion of the Earth, was proposed in the early
1950s to provide a more uniform time scale than that based on the
Earth's rotation. Markowitz devised a practical means for its
determination by inventing the dual-rate Moon camera bearing his name.
The first Markowitz Moon Camera was placed in operation at the Naval
Observatory in June 1952, and twenty were used around the world during
the International Geophysical Year (1957-1958). With data from these
cameras, Markowitz worked with Louis Essen at the National Physical
Laboratory in England to calibrate newly developed atomic clocks in
terms of the Ephemeris second. The fundamental frequency of cesium
atomic clocks, 9,192,631,770 Hz, which they determined, has defined the
second internationally since 1967.
</quote>
Here's some more-
http://www.sciam.com/askexpert_quest...38809EC588F2D7
(Of course it could change in the future. Someone might determine that it
is off by .000000001 Hz)
Don't forget to wind your Timex tonight.
"heirloom" <heirloom@nospamatall.com> wrote in message news:uE7g##2PDHA.2244@TK2MSFTNGP11.phx.gbl...
- Posted by VManes on July 1st, 2003
Now if they could just figure out how to synchronize the time differences
between men and women.
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- Posted by heirloom on July 1st, 2003
Good reading, Gary!!! Kinda corresponds with my question, huh? No doubt
about it, I am going to have to get one of them there mercury ion wrist
clocks.
Whew.....a thousand times more accurate than a cesium 133....baffles the
brain...
just when I had the Doppler effect down pat, too.
Heirloom, old and too much for me.
.....but, if the mercury ion clock was traveling faster than the speed of
light, would it lose time?
"Gary S. Terhune" <grystnews@mvps.org> wrote in message
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- Posted by heirloom on July 1st, 2003
....well, say another mercury ion clock that was not going faster than the
speed of light, for example. Geez, this is getting deep.
Heirloom, old and over my head
"Gary S. Terhune" <grystnews@mvps.org> wrote in message
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- Posted by Gary S. Terhune on July 1st, 2003
Well, assuming there *is* a "faster than the speed of light", which is a big
assumption, the relativity is lost. You can't compare them.
--
Gary S. Terhune
MS MVP for Windows 9x
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"heirloom" <heirloom@nospamatall.com> wrote in message
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- Posted by Hugh Candlin on July 1st, 2003
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You'd have to catch it first, to find out!
- Posted by Bill Blanton on July 1st, 2003
I think Einstein said that matter reaches infinite mass when it
reaches the speed of light. (of course, some say black holes
don't respect Einstein's rules 
"Gary S. Terhune" <grystnews@mvps.org> wrote in message news:O2Sok04PDHA.2480@tk2msftngp13.phx.gbl...
- Posted by Gary S. Terhune on July 1st, 2003
Think we could make the discussion of tachyons into another Godwin's Corollary?
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"Bill Blanton" <bblanton@REMOVEmagicnet.net> wrote in message
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- Posted by Hugh Candlin on July 1st, 2003
Bill Blanton <bblanton@REMOVEmagicnet.net> wrote in message
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I've never seen that. I do know that, the bigger the mass,
the faster any object has to travel to escape its gravitational pull.
Once sufficient mass has been attained, such that the speed
required to escape the gravitational pull of that mass
exceeds the speed of light, then nothing can escape.
Not even light itself. So the scientists dream up the
headline grabbing term "Black Hole".
I give that concept the same weight as
The Universe is xxx billion years old!
As the definition of the Universe is "Everything, everywhere, whenever"
you have to ask, What was there before?
The Universe is expanding!
You have to ask, Into what, pray tell?
The galaxies are rushing away from each other!
They cannot all be, otherwise the infinite Universe
would have to have a center, wouldn't it?
Are we off-topic yet?
- Posted by Gary S. Terhune on July 1st, 2003
<G> The omnipresent "they". What would we do without 'em?
Thanks, Noel, <s>.
--
Gary S. Terhune
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"Noel Paton" <NoelDPspamless@btopenworld.com> wrote in message
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- Posted by Noel Paton on July 1st, 2003
Always happy to oblige, Gary - got a shock seeing you in an ME group, until
I realised it was an x-post!
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Noel Paton (MS-MVP 2002-2003, Win9x)
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"Gary S. Terhune" <grystnews@mvps.org> wrote in message
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- Posted by Gary S. Terhune on July 1st, 2003
Yeah, I was shocked to find me in an ME group, too! Of a couple dozen regular
"ComputerGuy" clients, I only have one ME machine in the whole group. Its an HP
machine that came with ME, and I gotta admit it knows how to behave itself quite
nicely.
Unlike a whitebox MSI we purchased a couple of years ago for our publishing
business (now running XP and loving it.)
God, what a nightmare that was!
--
Gary S. Terhune
MS MVP for Windows 9x
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"Noel Paton" <NoelDPspamless@btopenworld.com> wrote in message
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- Posted by Noel Paton on July 1st, 2003
<G>
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Noel Paton (MS-MVP 2002-2003, Win9x)
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"Gary S. Terhune" <grystnews@mvps.org> wrote in message
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- Posted by Hugh Candlin on July 1st, 2003
Gary S. Terhune <grystnews@mvps.org> wrote in message
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I'm about to create a fresh ME installation.
I'll let you know how it turns out.
- Posted by Gary S. Terhune on July 1st, 2003
More than any other OS in history, ME is for ME-designed machines.
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