- #1

johnny_bohnny

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I've just recently started learning about relativity, and my question will be about the relative simultaneity, or precisely Andromeda paradox.

So in the original setup, if an observer is at rest with respect to Andromeda, he will consider some event, let's call it X, as his present. If another observer moves away from Andromeda, he will consider an earlier event of Andromeda's history, let's call it Y as his present. That's at least what should be the setup.

But if two observers are at rest mutually and of course with respect to Andromeda, and one starts moving away from it, accelerating to get in the position that I've previously mentioned, how will he be able to get from the moment that they both agree about to consider their present (since they are mutually at rest) to a moment when he considers his present to be 'earlier' than the present of the stationary observer. Basically, what happens during acceleration or the change of frames, so that one observer can get from one position of simultaneity defining to another?

Thanks in advance. Johnny