[time-nuts] Primary Time Standards
mikes at flatsurface.com
Thu Jul 14 10:25:48 UTC 2011
At 10:26 PM 7/13/2011, Jim Palfreyman wrote...
>But why is it that Caesium Clocks and Hydrogen Masers have an
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
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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