The ABC of Relativity, by Bertrand Russell, Part 2
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The Problem of Time in Different Places
In theoretical physics, no such parochial prejudices are permissible. A physicist on a comet, if there were one, would have just as good a right to his view of simultaneity as an earthly physicist has to his. We cannot therefore say unambiguously that two events in distant places are simultaneous. Such a statement only acquires a definite meaning in relation to a definite observer. The question of time in different places is perhaps for the imagination the most difficult aspect of the theory of relativity.
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