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.
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