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How does A know what has happened to B, simply by looking at his own clock?
Precisely my point. He can't tell B's time simply by looking at his own clock: he has to make a lot of assumptions. That's relativity.
Quote from: Halc on 02/05/2024 17:05:36You missed the fact that the Earth clock is inertial between the two events of the 'jump' and the traveling clock is not, so its worldline is half the temporal length that it would have had had it been inertial between its two events.Where does the number "half" come from?
You missed the fact that the Earth clock is inertial between the two events of the 'jump' and the traveling clock is not, so its worldline is half the temporal length that it would have had had it been inertial between its two events.