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General Relativity & GPS Satellites' Clocks
I was pleasantly surprised to find out that to keep the GPS navigation system accurate the clocks on-board each GPS satellite should tick faster than identical clocks on the ground by about 38 microseconds per day (45-7=38)! to counteract the General Relativistic effect once on orbit. I had been under the impression that the Relativity Theory doesn't have any day-to-day implication.

http://en.wikipedia.org/wiki/General_relativity
http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html
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