Re: [time-nuts] What time is it anyway?
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
On 28 March 2010 04:49, David Forbes dforbes@dakotacom.net wrote:
At 11:11 AM -0400 3/27/10, Bob Camp wrote:
I would bet that if you went deep enough into the details, that the Army
at some point was less than enthusiastic about having to ask the Navy when
ever they wanted to know what time it was.
My guess is that the Army just asked Western Union, who asked the Navy.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
I think that is the BIPM (http://www.bipm.org/en/home/) in association
with the IERS (http://hpiers.obspm.fr/)
Peter
On 28 March 2010 10:29, Steve Rooke sar10538@gmail.com wrote:
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
On 28 March 2010 04:49, David Forbes dforbes@dakotacom.net wrote:
At 11:11 AM -0400 3/27/10, Bob Camp wrote:
I would bet that if you went deep enough into the details, that the Army
at some point was less than enthusiastic about having to ask the Navy when
ever they wanted to know what time it was.
My guess is that the Army just asked Western Union, who asked the Navy.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
time-nuts mailing list -- time-nuts@febo.com
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--
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
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Steve Rooke wrote:
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
Just curious where you got those percentage numbers? A quick check says
they are in the ball park, but wondering where you got them.
On 28 March 2010 22:56, Rex rexa@sonic.net wrote:
Just curious where you got those percentage numbers? A quick check says they
are in the ball park, but wondering where you got them.
Wikipedia is your friend.
--
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
On 28 March 2010 22:38, Peter Vince pvince@theiet.org wrote:
I think that is the BIPM (http://www.bipm.org/en/home/) in association
This organisation seems to be more associated with physical standards.
with the IERS (http://hpiers.obspm.fr/)
This organisation claims to be an International body on Earth rotation
and celestial reference frames. Just what standardisation on "legal
time" this holds with countries outside France is unknown as they
don't seem to cite references outside their own organisation.
Perhaps it was a rhetorical question.
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
I think that is the BIPM (http://www.bipm.org/en/home/) in association
with the IERS (http://hpiers.obspm.fr/)
Peter
On 28 March 2010 10:29, Steve Rooke sar10538@gmail.com wrote:
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
By definition (ITU-R-TF.460-4, Annex 1), the keeper of UTC is BIPM with
assistance from the IERS. But "legal time", being a national matter, is
something quite different and might or might not be aligned with UTC,
depending on the individual nation state.
Steve Rooke wrote:
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
Here in Germany it's the PTB:
(Physikalisch-Technische Bundesanstalt)
http://www.ptb.de/cms/en/fachabteilungen/abt4/fb-44/ag-441/realisation-of-legal-time-in-germany.html
Gerhard
Chris Cheney wrote:
I think that is the BIPM (http://www.bipm.org/en/home/) in association
with the IERS (http://hpiers.obspm.fr/)
Peter
On 28 March 2010 10:29, Steve Rooke sar10538@gmail.com wrote:
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
By definition (ITU-R-TF.460-4, Annex 1), the keeper of UTC is BIPM with
assistance from the IERS. But "legal time", being a national matter, is
something quite different and might or might not be aligned with UTC,
depending on the individual nation state.
ITU gets its authority from being an UN organisation. The reason they
have TF.460-4 is because there are radio transmitters for time. Nowadays
that document should be handled differently than ITU-R.
BIPM gets its authority from the signature nations of the metric
convention, which then meet in the General Conference on Weights and
Measures (CGPM) and International Committee for Weigths and Measures.
http://www.bipm.org/en/convention/
http://www.bipm.org/en/convention/cgpm/
http://www.bipm.org/en/committees/cipm/
http://www.bipm.org/en/convention/member_states/
In addition to all that, there is a number of related organisations for
related calibration, traceability and accreditations. ISO is also a part
of the mixture.
Just go to BIPM and the above links and read for yourselves. With a
little curiosity you will eventually figure out how everything connects.
It all boils down to nations signing a number of binding agreements.
That creates a common reference system, mutual recognition, same
procedures etc.
Cheers,
Magnus
Eventually you get there:
http://www.bipm.org/en/scientific/tai/time_server.html
and find out that these folks have signed to it:
http://www.bipm.org/en/convention/member_states/
Think I'll skip the research as to how much of the World this covers.
On 29 March 2010 00:36, Magnus Danielson magnus@rubidium.dyndns.org wrote:
Chris Cheney wrote:
I think that is the BIPM (http://www.bipm.org/en/home/) in association
with the IERS (http://hpiers.obspm.fr/)
Peter
On 28 March 2010 10:29, Steve Rooke sar10538@gmail.com wrote:
What puzzles me is who is the keeper of "legal time" for the other
93.4% of land mass and 95.5% of population of the World other than the
US.
By definition (ITU-R-TF.460-4, Annex 1), the keeper of UTC is BIPM with
assistance from the IERS. But "legal time", being a national matter, is
something quite different and might or might not be aligned with UTC,
depending on the individual nation state.
ITU gets its authority from being an UN organisation. The reason they have
TF.460-4 is because there are radio transmitters for time. Nowadays that
document should be handled differently than ITU-R.
BIPM gets its authority from the signature nations of the metric convention,
which then meet in the General Conference on Weights and Measures (CGPM) and
International Committee for Weigths and Measures.
http://www.bipm.org/en/convention/
http://www.bipm.org/en/convention/cgpm/
http://www.bipm.org/en/committees/cipm/
http://www.bipm.org/en/convention/member_states/
In addition to all that, there is a number of related organisations for
related calibration, traceability and accreditations. ISO is also a part of
the mixture.
Just go to BIPM and the above links and read for yourselves. With a little
curiosity you will eventually figure out how everything connects.
It all boils down to nations signing a number of binding agreements. That
creates a common reference system, mutual recognition, same procedures etc.
Cheers,
Magnus
time-nuts mailing list -- time-nuts@febo.com
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and follow the instructions there.
--
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
The task of the BIPM is to ensure world-wide uniformity of measurements and
their traceability to the International System of Units (SI).
It does this with the authority of the Convention of the Metre, a diplomatic
treaty between fifty-four nations, and it operates through a series of
Consultative Committees, whose members are the national metrology
laboratories of the Member States of the Convention, and through its own
laboratory work.
The BIPM carries out measurement-related research. It takes part in, and
organizes, international comparisons of national measurement standards, and
it carries out calibrations for Member States.
So, the BIPM is "THE reference", because it result from international Meter
Convention . Every country (54), who sign this convention, participate to
elaborate the UTC by the mean of its own laboratories.
Cordialement
Alain
F4GBC
----- Original Message -----
From: "Gerhard Hoffmann" dk4xp@arcor.de
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Sunday, March 28, 2010 1:18 PM
Subject: Re: [time-nuts] What time is it anyway?
