On 02/07/2011 10:58, Tom Van Baak wrote:
Now to make a time-scale out of these identical but differing SI seconds does require some statement of common elevation. So this is why reported clock data is all adjusted to sea level in the computation of TAI (and hence UTC).
It is also why TAI's rate was adjusted in the 1990's to compensate for the red-shifted data that had been collected at NIST in Boulder, since it sits at about 5400' (1700m) above sea level (as well as other facilities not at sea level).
Warner _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
