On 2015-03-04 02:23, Steve Allen wrote on the
epoch of TAI:
Getting meaninglessly pedantic, in Survey Review v19 #143 p7 (1967)
A.R. Robins had been talking with Sadler and Smith and with that
information in hand he wrote that atomic time was identical to UT2 at
1958-01-01 T 20:00:00 Z
This, of course, disagrees with Guinot's memoir, but the various
realizations of UT2 then differed by centiseconds and the different
versions of atomic time were subsequently realigned by milliseconds.
And that date of 1958-01-01 was decided ex post facto at the 1959
August meetings where the US and UK decided to try coordinating their
broadcast time signals using cesium. So there really isn't an epoch
for TAI.
Well, there is not only personal recollections:
RECOMMENDATION S 4 (1970) of the 5th Session of the
Consultative Committee for the Definition of the Second:
4. The origin of International Atomic Time is
defined in conformance with the recommendations
of the International Astronomical Union (13th
General Assembly, Prague, 1967) that is, this scale
was in approximate agreement with 0 hours UT2
January 1, 1958.
Michael Deckers.
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