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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 Ellipse-An ellipse is a flattened circle....
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- Spring '11