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Illustration of Roemer's determination of the speed of light. In 1676 he observed a series of eclipses of the innermost satellites of Jupiter, which completes a revolution around the planet in 42
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Ole Rømer's use of the eclipses of Jupiter's satellites to measure the speed of light (1675). Ole Rømer (1644-1710) a Danish astronomer. Dated 18th century Stock Photo - Alamy
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Speed of Light and the Principle of Relativity - Special and General Relativity - The Physics of the Universe
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