Re: Y2K [OFFTOPIC]
H. Peter Anvin (firstname.lastname@example.org)
25 Jun 1998 18:29:08 GMT
Followup to: <Pine.LNX.3.95.980625124630.241Aemail@example.com>
By author: "Richard B. Johnson" <firstname.lastname@example.org>
In newsgroup: linux.dev.kernel
> It's called Poynting-vector compensation. The GPS satellite orbits form
> the outer surface of a sphere, with the center of the earth at its center.
> If you could read the GPS time from the center of the earth, they would
> all be identical. The actual wall-clock time of the satellites is not
> important although it's maintained within a few microseconds of whatever
> NIST says it should be. It's the difference between carrier
> phase/frequency and time/position that makes GPS work. We don't care
> who's clock is used.
Unless, of course, you're using GPS to obtain wall clock time...
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