Gravitational shifting can be towards the blue, as when a photon approaches a black hole. Or the re-tuning of the atomic clocks on GPS satellites.
Is that in any way detectable?
Or the re-tuning of the atomic clocks on GPS satellites.
I know that GPS technology takes into account Relativity theory, both Special and General. Special deals with the high rate of speed of the satellites and the effects that has on time (between the sat and ground), while General deals with the effects of time due to Earth's gravitational field, which of course is stronger at the surface than high above it at the sat's altitude.
Interestingly, as the speed aspect causes the sat's clock to tick more slowly (from the ground's perspective), the increased gravity at the surface causes the ground-based clock to tick more slowly. The surprising (to me anyway) net result is that the gravitational effects win out slightly over the speed effects, and so the earth-bound clock ticks out time more slowly than the sat's, and therefore adjustments need to be made to insure better precision of the system.