This series of webpages is part of a course, called Astronomy 161: The Solar System, offered by the Department of Physics and Astronomy at the University of Tennessee. This section covers the view of the universe that astronomers held up to 500 years ago, including: the apparent motion of the planets (such as retrograde motion) on the celestial sphere; the universe of Ptolemy and Aristotle, involving epicycles; and medieval Aristotelian astronomy.
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