Kepler’s Laws of Planetary MotionBecause of some religious and political difficulties, Kepler was banished from Graz on August 2, 1600.At the same year, Kepler sent a letter about his thoughts to Tycho , and then Tycho invited Kepler to be his assistant. However, Tycho didn’t trustKepler, he afraid that Kepler will more famous than him one day. He just let Kepler see only part of his research data and set him the task of understanding the orbit of theplanet Mars which was still a problem need people to deal with. In 1601, Tycho died. Kepler took over Tycho's work and began to compile the Rudolph star list. However, Kepler’s interest and attention are more focused on improving and perfecting Copernicus’s heliocentric theory and on the study of the nature of planetary orbits. Hefound that the observation data of Tycho was inconsistent with the Copernican and Ptolemy systems. He is determined to find the cause of this inconsistency and the true
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Astronomy, Planet, Kepler s laws of planetary motion