[time-nuts] What's the time Mr Wolf...
Steve Rooke
sar10538 at gmail.com
Thu Oct 30 18:41:18 UTC 2008
Thanks for the very informative reply Tom.
2008/10/31 Tom Van Baak <tvb at leapsecond.com>:
>
>> 11) Extrapolating this, a point on the Equator would be moving faster
>> that a point at the poles or even Greenwich, for that matter. So would
>> a clock at each location move out of synchronisation with each other?
>
> Yes, and this also is taken into account. When you get down
> to measuring absolute frequency at 1e-14 and 1e-15 levels one
> always takes the local gravitational field into account, which is
> mostly a function of altitude, but also latitude.
Guess I've been dumb here but this must mean that not only is time
affected by relativistic effects but also oscillators as well then.
If gravity affects frequency, can this effect be seen as a daily
change in the EFC voltage of a GPS locked standard as caused by the
Moon? Does this also affect the frequency of the atomic standards used
to measure time? All this must make the measuring of absolute
frequency to the high orders of accuracy quite complex.
73, Steve
--
Steve Rooke - ZL3TUV & G8KVD
Omnium finis imminet
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