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Quote#Wisdom

If the definition of simultaneity is given from a moving system, the…

Quote byHans Reichenbach · 1891–1953

Commonly attributed — not confirmed in an authoritative edition. Cited on Wikiquote to: The Philosophy of Space and Time (1928, tr. 1957).

English (original)

If the definition of simultaneity is given from a moving system, the spherical surface will result when Einstein's definition with є = 1/2 is used, since it is this definition which makes the velocity of light equal in all directions.

— Hans Reichenbach

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