light (Hathaway). Roemer was interested in the planet Jupiter and its moons and made many observations concerning their orbits and eclipses. Based on calculations of Roemer, as well as previous astronomers, Io, one of Jupiter’s moons, makes a revolution around Jupiter every 42 hours, 28 minutes, and 34 seconds (A Case History in Astronomy and Physics: The Speed of Light). This observation led Roemer to believe that he could accurately predict the eclipses of Io. Contrarily, his predictions were…
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