The ABC of Relativity, by Bertrand Russell, Part 2
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The Evolution of Time
The universal cosmic time which used to be taken for granted is no longer admissible. For each body there is a definite time order for the events in its neighborhood. Our own experience is governed by the proper time for our own body. The history of a physicist as observed by a beta particle would resemble Gulliver's travels. What really is measured by a clock? When we speak of a clock in the theory of relativity, we mean anything which goes through some regular periodic performance.
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