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Unformatted text preview: After Tycho died, his assistant Johannes Kepler, too his place.Kepler studied Tychos precise observation of the planets.He noticed petterns in their motion never seen before.His first model for the planets involved geometric shapes. Initially, Kepler thought the orbits of the planets had the same proportions as the 5 perfect solids of geometry. He worked on this idea for years, but finally admitted it was a failure.However, kepler did not give up.He found that the planets motion could be explained if he gave up the idea of the circular orbits. In time he discovered that all planets follow the same three rules. . Keplers Laws of Planetary Motion I. The orbits of the planets are ellipses with the sun at one focus II. A line from a planet to the sun sweeps over equal areas in equal intervals of time. Size of an EllipseAn ellipse is a flattened circle....
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 Spring '11
 McCarthy

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