Re: Perfect clocks

Tom Roberts wrote:

On a GPS satellite, the usual definition of the second applies. But in
order for the SIGNALS from GPS satellites to be received on earth at the
correct frequencies, the time-base on the satellite must tick about 4
parts in 10^10 more slowly than a corresponding time-base on earth's
geoid (mean sea level).

monseneor, you misundrestand the entire procedure -it's not about the
signal propagation, but the difference in the gravity gradient. The signals
transmission are implied, but only after that.