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Unformatted text preview: -Yet he believed circular motion-De Revolutionibus Orbium Coelestium-Copernicus’ Heliocentric Model o Sun is at center o Earth orbits like any other planet o Inferior planet orbits are smaller o Retrograde motion occurs when we “lap” Mars & the other superior planets o Simpler model than Ptolemy – but not better at predicting positions, since it assumed circular motion. Tycho Brahe (1546 – 1601)-Greatest observer of his day-Uraniborg (an astronomical/astrological observatory operated by Tycho Brahe)-Charted accurate positions of planets-Observed a supernova in 1572-Espoused a hybrid universe with Sun orbiting earth and the other planets orbiting the Sun. Johannes Kepler (1571 – 16300-Greatest theorist of his day-A mystic-There were no heavenly spheres-Forces made the planets move Kepler’s Laws 1. Each planet’s orbit around the Sun is an ellipse, with the Sun at one focus....
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- Winter '08
- Nicolaus Copernicus, Planet, Heliocentrism, History of astronomy