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 <[email protected]> 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
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