So everything is derived from this oscillator, which is actually
10.2299543 MHz. This -4.57 mHz corrects for relativistic effects.
Neat. Thanks.
I got curious. How does that compare to the Doppler shifts?
google found this nice description of GPS :
btw... I once heard a story that early GPS SVs could turn off the
relativistic compensation. There was also a switch to reverse the
sign... ;-)
I don't remember hearing there was a sign reversal switch,
but all the other details on the first pre-GPS SV are here:
On Mon, 2008-11-03 at 00:21 -0800, Hal Murray wrote:
So everything is derived from this oscillator, which is actually
10.2299543 MHz. This -4.57 mHz corrects for relativistic
effects.
Neat. Thanks.
I got curious. How does that compare to the Doppler shifts?
google found this
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Steve Rooke
Sent: Thursday, 30 October 2008 11:16 PM
10) If they are geostationary, or move in relation to the ground,
how are the affects of the Einstein time dilation handled as they
may be travelling
Hi,
This may have already been covered in this group so please excuse me
for not combing the archives. I could Google for this but I'll get a
quicker answer here and I know it will be the correct one.
!) Who decides on what is the correct time?
2) Is the time standard stored on one master
At 01:46 +1300 31-10-2008, Steve Rooke wrote:
I could Google for this but I'll get a
quicker answer here
To me that reads as My time is more valuable than yours.
Not to pick on you in particular, but I see this attitude a lot
lately in fora, support groups and
At 02:09 +1300 31-10-2008, Steve Rooke wrote:
it's not always easy to formulate a
phrase to trigger the answer required out of Google and which sources
should I go to or believe.
Fair enough. For your first six questions, I'd use keywords including
nist and time,
My apologies to the list, it was unthoughtful of me. This was not my
intent, what I really meant was it's not always easy to formulate a
phrase to trigger the answer required out of Google and which sources
should I go to or believe. Really this was more meant to be a
compliment to the
Hi,
This may have already been covered in this group so please excuse me
for not combing the archives. I could Google for this but I'll get a
quicker answer here and I know it will be the correct one.
!) Who decides on what is the correct time?
BIPM, the same guys that keeps the meter
On Thu, Oct 30, 2008 at 8:46 AM, Steve Rooke [EMAIL PROTECTED] wrote:
Hi,
This may have already been covered in this group so please excuse me
for not combing the archives. I could Google for this but I'll get a
quicker answer here and I know it will be the correct one.
I think it was
Tom,
Have you received any of my recent PMs?
2008/10/31 Tom Van Baak [EMAIL PROTECTED]:
...
/tvb
73
Steve
--
Steve Rooke - ZL3TUV G8KVD
Omnium finis imminet
___
time-nuts mailing list -- time-nuts@febo.com
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2008/10/31 michael taylor [EMAIL PROTECTED]:
I think it was approximately a year ago in the archives that there was
a good thread of suggested (mostly online) readings.
As well, an affordable and highly readable book is _Splitting the
Second : The Story of Atomic Time_ by Tony Jones,
Thanks for the very informative reply Tom.
2008/10/31 Tom Van Baak [EMAIL PROTECTED]:
11) Extrapolating this, a point on the Equator would be moving faster
that a point at the poles or even Greenwich, for that matter. So would
a clock at each location move out of synchronisation with each
2008/10/31 J.D. Bakker [EMAIL PROTECTED]:
At 02:09 +1300 31-10-2008, Steve Rooke wrote:
it's not always easy to formulate a
phrase to trigger the answer required out of Google and which sources
should I go to or believe.
Fair enough. For your first six
Hi Steve;
I think God decides the time the fun parts is watching humans try to
sort it out.
Currently the World has accept a specific number of vibrations
(9,192,631,770) of a Cesium-133 atom to define one second. For the USA
the master clock F1 is in Colorado and although the GPS sat's are
If gravity affects frequency, can this effect be seen as a daily
change in the EFC voltage of a GPS locked standard as caused by the
Moon? Does this also affect the frequency of the atomic standards used
to measure time? All this must make the measuring of absolute
frequency to the high
In message: [EMAIL PROTECTED]
Steve Rooke [EMAIL PROTECTED] writes:
: 2008/10/31 Tom Van Baak [EMAIL PROTECTED]:
:
: 11) Extrapolating this, a point on the Equator would be moving faster
: that a point at the poles or even Greenwich, for that matter. So would
: a clock at each
The tidal effects are much smaller than those from position. I don't
think that these effects are visible at the 10-14 or 10-15 level, but
since I don't know what level they are visible at, I can't be sure.
I'm sure that someone on this list, maybe as part of their PhD thesis,
has measured
-nuts] What's the time Mr Wolf...
In message:
[EMAIL PROTECTED]
Steve Rooke [EMAIL PROTECTED] writes:
: 2008/10/31 Tom Van Baak [EMAIL PROTECTED]:
:
: 11) Extrapolating this, a point on the Equator would be
moving faster
: that a point at the poles or even Greenwich
Thanks for your understanding and useful pointers, this is exactly
what I was referring to. If you don't know where to start, it's not
always easy to get to the goal.
This may not directly answer any of your questions, but it sure is a fun read.
* Time Too Good to Be True, Daniel
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Hal Murray
Sent: Thursday, October 30, 2008 4:35 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What's the time Mr Wolf...
Thanks for your understanding
This may not directly answer any of your questions, but it sure is a fun read.
* Time Too Good to Be True, Daniel Kleppner
Physics Today, March 2006, page 10
HTML version (needs cookies):
http://scitation.aip.org/error/cookies.jsp?url=http%3a//scitation.aip.org/jour
2008/10/31 Hal Murray [EMAIL PROTECTED]:
This may not directly answer any of your questions, but it sure is a fun read.
* Time Too Good to Be True, Daniel Kleppner
Physics Today, March 2006, page 10
HTML version (needs cookies):
2008/10/31 Tom Van Baak [EMAIL PROTECTED]:
http://www.physicstoday.org/vol-59/iss-3/pdf/vol59no3p10_11.pdf
Hal, and James, see my follow-up to Kleppner's article...
An Adventure in Relative Time-Keeping
http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_60/iss_3/16_1.shtml
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Van Baak
Sent: Thursday, October 30, 2008 5:06 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What's the time Mr Wolf...
This may not directly answer any
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