Simplicius on the Planets and Their Motions: In Defense of a Heresy
Though the digression closing Simplicius commentary on Aristotle s "De caelo" 2.12 has long been misread as a history of early Greek planetary theory, it is in fact a creative reading of Aristotle to maintain the authority of the "De caelo" as a sacred text in Late Platonism and to refute the polemic mounted by the Christian, John Philoponus. This book shows that the critical question forced on Simplicius was whether his school s acceptance of Ptolemy s planetary hypotheses entailed a rejection of Aristotle s argument that the heavens are made of a special matter that moves by nature in a circle about the center of the cosmos and, thus, a repudiation of the thesis that the cosmos is uncreated and everlasting.
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Chapter One The Heresy of NonHomocentric Aetherial Motion
Chapter Two The Heretical Rejection of All Hypotheses
Chapter Three Simplicius the Apologist
Chapter Four Simplicius the Historian
Chapter Five Conclusion
In Aristotelis de caelo 210
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aether Alexander Alexander’s Almagest appears argument Aristarchus Aristotle Aristotle’s astronomical astronomical hypotheses Aujac axis Bossier n.d.a Bowen caelo Callippus carrying sphere celestial sphere circular citation claim Cleomedes commentary cosmos dicult Diels diferent distance diurnal diurnal motion Earth eccentric eclipses efectively epicyclic Eudemus Eudoxus fact Geminus greater number Greek Grosseteste’s heavenly bodies heavens Heiberg Hipparchus homocentric hypotheses hypothe late Platonic late Platonists lunar Mars means Mercury Meta Moerbeke’s Moon’s Moraux move Mueller observed occultation ofered ofthe opposite Philoponus physical theory planetary hypotheses planetary motions planets Plato problem Proclus Ptolemy Ptolemy’s Pythagoreans question revolution rotation Saturn save the phenomena scil second sphere sidereal periods simple body Simplicius Sosigenes specic speed spherical stations and retrogradations synodic period theorist things third sphere Timaeus translation unwinding spheres Venus wandering stars xed sphere xed stars Xenarchus zodiacal circle ατν δι κα κατ περ τν