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Benchmarks and the speed of light


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An interesting thread (and links) on the professional forum talks about Michelson's measurement of the speed of light in the 1920's and the assistance the US C&GS gave him.  They ran a very long baseline to better accuracy than I can imagine, and triangulated to marks on two mountains.  Michelson sent light from one to a mirror on the other and measured the round-trip travel time.



Edited by Bill93
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