Speed of Light Measurement, 1676

Illustration from a 1676 article on Olaus Roemer's measurement of the speed of light, based on observations of the orbits of Jupiter's moon Io in relation to the Earth's movement toward and from the planet. Ole Christensen Romer (1644 - 1710), was a Danish astronomer whose observations were key to the Scientific Revolution of the 17th century

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1676 Calculation Christensen Diagram Geometry Olaus Roemer Romer

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