At 10:26 PM 7/13/2011, Jim Palfreyman wrote...
But why is it that Caesium Clocks and Hydrogen Masers have an
adjustment
facility?
Cs defines the second, but only at the physically impossible
temperature of absolute zero. Relativistic effects make it so the
second is a different length at different altitudes.
So, when one wants to track global "mean" time, individual clocks need
adjustment.
Which brings up another question - what altitude (=geoid?) is TAI
defined for? I don't know enough about general relativity, but think
the latitude would make a difference, too?
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