« on: 25/09/2023 15:45:54 »
According to A, twin B and C only change their frame of reference once.I don't understand your confusion, especially since it is your scenario.
You should stop referring to inertial frames as frames of reference, using the wrong terminology can lead to additional confusion.
In your scenario twin A starts in the earths inertial frame and then accelerates to a new inertial frame. He then decelerates to Alpha Centauri's inertial frame, so in your example there are 2 inertial frame changes. Twin B does exactly the same number of inertial frame changes. Observer A, B and C all agree on the number of changes in inertial frames of A and B.
I am not going to address observer D since this was not part of the original scenario, it is unnecessary and it only is going to cloud the issue.
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