Re: Perfect clocks

Volney wrote:

On 5/4/2024 11:46 AM, 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).

 
Perhaps it may be easier to understand if it is compared to the Doppler
effect of a train horn.
Consider a train whose horn sounds at exactly 440 Hz (musical tone A4).
Another train approaches at 134.796 km/hr. The passenger on the platform
hears its horn at 440 Hz or A4. But the passengers aboard the train
insist it sounds at 391.995 Hz, better known to musicians as G or G4.
The signal from the GPS birds is much like this (frequency shifted but
for a different reason), but its master frequency is set so that the
signal is received at the correct frequency. Much like the second train.

nit true, the mater is not EM. Air is mater, please remembre that. Since

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they think it's 2026 lol !!