Abstract
In this work, we show that the null result of the Michelson–Morley experiment in vacuum is deeply connected with the notion of time. It can be deduced, without any mathematics, from the assumption only that all good clocks can be used to measure time with the same results, independently of the machinery involved in their manufacturing. A second important assumption, intrinsic to the very notion of time, is that clocks measure time in the same way in different frames, i.e., the notion of time is the same in all inertial frames. Under this assumption, we point out that the ‘postulate’ of constancy of the ‘two-way’ speed of light in vacuum in all frames independently of the state of motion of the emitting body is also strongly related to the concept of time, together with the existence of a limit speed in the ‘rest frame’. This postulate simply results from the construction of clocks where ‘tic–tacs’ are made by objects travelling with the limit speed, taken to be the speed of light.
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