Question: The GPS satellites described in Problem 21 are placed in orbits for which the period is approximately 12 h. (They are thus not in geosynchronous

The GPS satellites described in Problem 21 are placed in orbits for which the period is approximately 12 h. (They are thus not in geosynchronous orbits.) Estimate the time it takes a GPS signal to travel to the Earth’s surface from
(a) A GPS satellite that is directly overhead
(b) A GPS satellite that is on the horizon.

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