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When addressing the notion of proper time in the theory of relativity, it isusually taken for granted that the time read by an accelerated clock is givenby the Minkowski proper time. However, there are authors like Harvey Brown thatconsider necessary an extra assumption to arrive at this result, the so-calledclock hypothesis. In opposition to Brown, Richard T. W. Arthur takes the clockhypothesis to be already implicit in the theory. In this paper I will present aview different from these authors by recovering Einstein's notion of naturalclock and showing its relevance to the debate.

Time in the theory of relativity: on natural clocks, proper time, the clock hypothesis, and all that