The GPS satellites are in circular orbits at a height of 20,200 km above Earths surface, where

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The GPS satellites are in circular orbits at a height of 20,200 km above Earth’s surface, where their orbital period is 12 sidereal hours. If the ticking rates of the clocks on the satellites were not corrected for the gravitational redshift, roughly how long would it take them to accumulate a time shift, relative to clocks on Earth, large enough to degrade the GPS position accuracy by 10m? by 1 km?

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