Kennedy-Thorndike Experiment

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Kennedy-Thorndike experiment ('Experimental Establishment of the
Relativity of Time'), first conducted in 1932, is a modified form of the
Michelson-Morley experimental procedure. The modification is to make one
arm of the classical Michelson-Morley (MM) apparatus very short. It
served as a test for special relativity to verify time dilation:
according to special relativity, no phase shifts will be detected while
the earth moves around the sun, while such would result from length
contraction alone.