« on: 15/01/2021 06:33:53 »
There is no way to detect absolute gravitational potential, but there is a way to detect the gradient and direction.That was measuring the difference in an accelerated reference frame, which works anywhere in space, even in a completely flat gravitational field. It was detecting the direction of acceleration, which can be more easily determined with a plumb bob than a million dollar clock.
- Some of the most accurate atomic clocks have been used in an experiment where they were synchronised to each other, and then one was raised by 1 foot, and the difference in clock rates was measurable.
As you say, this is not exactly a local measurement.Is OK. The plumb bob isn't a local measurement either, but both can be done in a box, and that's what counts.
Point is, you can't measure which way Earth is using your method in a non-accelerated environment (anywhere where the plumb-bob doesn't work). So two clocks a meter apart in a satellite will stay in sync regardless of their orientation.
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