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Johannes Kepler 1571-1630 “The first astrophysicist and the last scientific astrologer.”
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Key Events in Kepler’s Life 1571: Born in Weil der Stadt, Swabia, Germany 1589-1594: Attended the University of Tübingen 1600-1601: Brief cooperation with Tycho Brahe 1609: Published first two laws of planetary motion 1619: Published third law of planetary motion 1627-1630: Publication of the Rudolphine Tables, involvement in Thirty Years’ War, and death at Regensburg, Bavaria, Germany
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Kepler’s First Model of the Solar System Based on his hypothesis of a geometrically ordered universe Includes only six planets (Uranus and Neptune not discovered yet) Accepted by Kepler for many years, until he discovered the planetary laws
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Kepler’s Laws of Planetary Motion First law: “A planet moves in an ellipse, with the sun at one focus” Second law: “A planet sweeps out equal areas and equal time” Third law: “The squares of the periods of the planets are proportional to the cubes of their average distances from the sun”
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Major Works by Kepler Mysterium Cosmographicum: Published 1596. Outlines his theory of a geometric universe and how it came about Astronomia Nova: Published 1609. Discourse on Tycho’s data and the results of Kepler’s investigation of Mars’ orbit, significant for its first two laws of planetary motion Harmonices Mundi: Published 1619. Discusses the third and final law of planetary motion Rudolphine Tables: Published 1627. Kepler’s last major work is a compilation of his and Tycho’s data in the form of star charts and planetary catalogues, named after Holy Roman Emperor Rudolf II
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References http://www-history.mcs.st- andrews.ac.uk/Biographies/Kepler.html http://www-history.mcs.st- andrews.ac.uk/Biographies/Kepler.html http://galileo.rice.edu/sci/kepler.html http://www.hulu.com/watch/63319/cosmos-the- harmony-of-the-worlds http://www.hulu.com/watch/63319/cosmos-the- harmony-of-the-worlds
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