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Key Facts In This Video
There are 30 GPS satellites in space. To triangulate its location, a device has to receive signals from four of them at once. 00:09
Special Relativity tells us that moving clocks run slow, and General Relativity tells us that clocks run faster higher up in a gravitational field. 00:25
There are always at least four GPS satellites visible from any point on Earth. 01:15
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