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Johannes Kepler, born December 27, 1571, Weil der Stadt, Württemberg, Germany and died November 15, 1630, Regensburg, German astronomer who discovered three major laws of planetary motion.

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Kepler's Laws are wonderful as a description of the motions of the planets. Isaac Newton (1642-1727) provided a more general explanation of the motions of the planets through the development of Newton's Laws of Motion and Newton's Universal Law of Gravitation.

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All planets move about the Sun in elliptical orbits having the Sun as one of the foci.

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A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.

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The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.