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Published online by Cambridge University Press: 28 February 2022
Much has been written on the 1905 paper in which Einstein founded the special theory of relativity, his justly famous “Zur Elektrodynamik bewegter Körper” [4]. In it he innovatively defined the simultaneity of events at two distant points by imagining a light signal to be sent from one point to the other and back. In effect he defined the midpoint of the time interval between the signal's emission and return at one point to be simultaneous with its reflection at the other. And a large fraction of the writing about this paper (e.g., [19], [20], [3], [12]) has been concerned to show that, without denying any physical fact, he could have chosen any other point in the interval and thereby given an equally satisfactory alternative definition.