- #36
atyy
Science Advisor
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MikeLizzi said:Hi atyy,
Just reading the summary of the reference you provided tells me it has nothing to do with the issue I am trying to raise. A lot of posting have been put up and I wonder if the issue I am trying to raise is getting lost.
Yes, the issue you are trying to raise is getting lost. Although in the twin paradox, we can do what you are asking, more generally, about the point of view of various observers in terms of coordinates is irrelevant. The elapsed proper time along a worldline is a geometric invariant, and that is all there is to it.