“By a clock we understand anything characterized by a phenome…”

“By a clock we understand anything characterized by a phenomenon passing periodically through identical phases so that we must assume, by the principle of sufficient reason, that all that happens in a given period is identical with all that happens in an arbitrary period.”

— Albert Einstein

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Source

Title: Wikiquote: Albert Einstein
Type: reference · Secondary source
Held by: Wikiquote

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Context

"Principe de relativité" Archives des sciences physiques et naturelles (1910) ser. 4. 29 5-28 pp. 125–244, as quoted by Julian Barbour, "The Nature of Time" (Mar 20, 2009) p. 7, arXiv:0903.3489.

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Einstein, Albert. (n.d.). Wikiquote: Albert Einstein. Wikiquote. https://en.wikiquote.org/wiki/Albert_Einstein

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