Measuring the Speed of Light: Michelson In 1926, Albert Michelson measured the speed of light with a technique similar to that used by Fizeau. Michelson used an eight-sided mirror rotating at 528 rev/s in place of the toothed wheel . The distance from the rotating mirror to a distant reflector was 35.5Km .If the light completed the 71.0km- round trip in the time it took the mirror to complete one-eighth of a revolution, what is the speed of light?