Io

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First Estimate of theSpeed of Light
(1675)
Jupiter
Io
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Olaus Roemer1675
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Christian Huygens1629 - 1695
Correctly interpreted the discrepancy and found
the speed of light.
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First modern measurement for thespeed of light.
Albert Michelson1851 - 1931
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How fast must the mirror rotate (in rev/sec) to
rotate an 1/8th of a revolution in the time the
light is on its 70 km journey?
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Velocitylight 3 x 108 m/s
35 kilometers(70 km round-trip)
LASER