preilley_...@comcast.net said: > I have a question. I, of small brain, am wondering: if the time > difference between the top of the mountain and the bottom of the mountain is > 20 nS over 24 hours could you repeat the same experiment using GPS? The > time difference of 20 nS is measurable using GPS.
The experiment has already been run. (is being run?) The GPS satellites are much higher than any mountain. Their clocks are adjusted so that they will be the right frequency when the signal gets down here. There are actually two corrections, one each for special and general relativity. One is 45 microseconds per day, the other is 7 microseconds per day in the other direction. preilley_...@comcast.net said: > The GPS clock must run faster on the mountain top than the GPS at the > mountain base and yet the two remain synchronized to the satellite > reference. Therefore the GPS 1 PPS signal (measurable to a few nS) must > be wrong in in one of the local frame references. If you adjusted a clock on the mountain top to track GPS, then brought it down to the lab at the bottom, it would run at a slightly different frequency. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
