B Pound & Rebka Experiment: Earth's Spin Rotation Speed

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The Pound-Rebka experiment measured gravitational time dilation using a height difference of 22.5 meters, with both the source and receiver analyzed in a rest frame where they were stationary. The discussion highlights that while there is a speed difference due to Earth's rotation, it is negligible and does not significantly affect the experiment's results. Participants clarify that the analysis did not require accounting for this speed difference, as it is a frame-dependent quantity. The gravitational effects considered were based on local measurements of gravitational acceleration rather than relative velocities. Overall, the experiment's findings are attributed to gravitational redshift rather than any influence from speed differences.
  • #31
Sagittarius A-Star said:
In the OP it does not say "the relative velocity between the source and the emitter"
It says "speed difference", yes. That's just a quibble over terminology. You can go back and make that substitution in all of my posts; it won't change anything of substance.

Sagittarius A-Star said:
In the ECI, you can calculate invariant quantities
Sure, but the "speed difference" is not one of them.
 
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  • #32
Vanadium 50 said:
Except Dale.
As far as I can tell, @Dale agrees with me. If I'm mistaken about that, he can correct me.
 
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