SR has to do with different velocities and how they'll be observed by people moving at those or other differing velocities given the experimentally confirmed fact that light speed (which is what's used for observing) is absolute rather than relative.
Originally Posted by TOEfetish
SR is fairly easy to get a reasonable grip on if you can keep your coordinates organized and use the right one for each observer.
The moment you involve acceleration you get over into GR territory, which, since all the clocks in your experiment are experiencing acceleration, was where you were from the start.
Reductionist and proud of it.
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