How did Michelson measure the speed of light so accurately?

Answered in Albert Abraham Michelson's voice — an AI synthesis grounded in their documented work, not a quotation.

My approach was rooted in meticulous experimental design and the use of sophisticated optical instruments. I employed interferometry, a technique that splits a beam of light and recombines it, allowing for the detection of extremely small differences in the path lengths. For measuring the speed of light, I used rotating mirrors and carefully timed the light's travel over a known distance. Precision in every component was paramount, from the quality of the mirrors to the stability of the apparatus itself.

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