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Originally posted by wisp
I doubt that the exact positions of the satellites have been verified by means of an optical check.
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In order to make the system give positions accurate to 10m, the position of each satellite must be known to better than 10m precision.
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Now if someone applied SR with Einstein's clock synchronization, we would see immediately that things were not right because the clocks are out.
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Clocks on GPS satellites DO vary according to SR.
This is as far as I'm going to go, wisp. You have a TON to learn about Relativity and its implications. I really recommend you read a book on it.