part1_history - 8/23/2009 The Motion of Planets History of...

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8/23/2009 1 The Motion of Planets History of Astronomy Theory? Hypothesis? Law? Scientific Method? How is science done? Observations Experiments Explanations Theories Laws Repeat Assumptions of Early Models Geocentric - Earth in the middle • Everything orbits the Earth • Stars are located on the Celestial Sphere • Everything moves in uniform circular motions
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8/23/2009 2 Earth Deferent Epicycle Mars Equant Claudius Ptolemy (87-165) The Dark Ages Nicolaus Copernicus (1473-1543) Errors building up Must be a better way! Let’s try a Heliocentric system! Not any better though
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8/23/2009 3 Tycho Brahe (1546-1601) Comet – beyond the Moon Supernova – far away Naked eye observations of planets Accuracy through repetition Best observations of planetary positions Hired “nerd” to help calculate model Died…. Johannes Kepler (1571-1630) Worked for Brahe Took data after his death Spent years figuring out the motions of the planets Came up with… Three Laws of Planetary Motion
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part1_history - 8/23/2009 The Motion of Planets History of...

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