On 2014-11-05 16:27, Zefram wrote:
....................................................... UTC is always
an integral number of seconds offset from TAI, and so by construction
UTC(NPL) is always an integral number of seconds offset from TAI(NPL).
Hence each of the marks also occurs at the top of a second of TAI(NPL).
The symbol TAI(k) is defined in
RECOMMENDATION ITU-R TF.536-2: Time-scale notations
of 2003 with the text:
TAI(k): Time-scale realized by the institute âkâ and defined
by the relation TAI(k) = UTC(k) + DTAI, where DTAI
is the number of integral seconds specified by the
International Earth Rotation Service (IERS) as
being the difference between UTC and TAI;
I do not know whether that notation has ever been put
to serious use outside this recommendation.
The contributions by the various metrology institutes to TAI
are independent from the UTC(k) and are denoted by TA(k) in
Circular T by the BIPM. The recommendation explains it as:
TA(k): Atomic Time-scale, as realized by the institute âkâ;
Michael Deckers.
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