:The "experimental observation" and "[contrived] theoretical predictions" happen to match. This should surprise no one, since relativity is correct. The GPS adjustments may be made by computers that are using observed ephemeris data from the satellites, but '''everyone involved knows''' that the '''basis''' for those adjustments (7 us/day up for SR; 45 us/day down for GR) is relativity. No one operating the GPS control stations will tell you that "We fudge the satellite clocks by 38 microseconds per day, but we don't know why this is needed." They knew that they would need the correction, based on relativity, before the satellites were launched; the correction mechanism was built in before launch. Very fine "tweaking" of the clocks is made by the control stations, but that's because of uncertainty of the satellites' orbits. The tweaking is not because relativity is wrong. See [http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html this article] for an explanation of the 38 microsecond correction. [[User:SamHB|SamHB]] 22:00, 7 June 2015 (EDT) | :The "experimental observation" and "[contrived] theoretical predictions" happen to match. This should surprise no one, since relativity is correct. The GPS adjustments may be made by computers that are using observed ephemeris data from the satellites, but '''everyone involved knows''' that the '''basis''' for those adjustments (7 us/day up for SR; 45 us/day down for GR) is relativity. No one operating the GPS control stations will tell you that "We fudge the satellite clocks by 38 microseconds per day, but we don't know why this is needed." They knew that they would need the correction, based on relativity, before the satellites were launched; the correction mechanism was built in before launch. Very fine "tweaking" of the clocks is made by the control stations, but that's because of uncertainty of the satellites' orbits. The tweaking is not because relativity is wrong. See [http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html this article] for an explanation of the 38 microsecond correction. [[User:SamHB|SamHB]] 22:00, 7 June 2015 (EDT) |