CRAWFORD LIBRARY / ROYAL OBSERVATORY, EDINBURGH / SCIENCE PHOTO LIBRARY CRAWFORD LIBRARY / ROYAL OBSERVATORY, EDINBURGH / SCIENCE PHOTO LIBRARY
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Astronomia Nova. Page from Johannes Kepler's Astronomia Nova (New Astronomy, 1609). The page shows the comparison between the heliocentric Copernican system, the ancient, geocentric Ptolemaic system, and Tycho's compromise "geo- heliocentric" system. Kepler later abandoned such comparisons because he (correctly) believed that only the heliocentric model, in which planets of the Solar System orbit the Sun, could offer a satisfactory explanation of celestial physics. This book was the most important volume by Kepler.
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