How A GPS Works & Relativity
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How a GPS works and why the satellite clocks have to be slowed down daily by 38 microseconds due to the effects of Einstein's theory of relativity.

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The Global Positioning System (GPS) is a navigational tool that can pinpoint your location to within a few meters.   Surprisingly, it incorporates a number of effects from Einstein's theory of relativity.    Video by the Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada
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