The book contends that the digression ending Simplicius’ In de caelo 2.12 is not a proper history of early Greek planetary theory, but a creative atempt to show that to accept Ptolemy’s planetary hypotheses one need not repudiate Aristotle’s argument that the cosmos is eternal.

Oxford Studies in Ancient Philosophy is a volume of original articles on all aspects of ancient philosophy. The articles may be of substantial length, and include critical notices of major books. OSAP is now published twice yearly, in both hardback and paperback. 'The serial Oxford Studies in Ancient Philosophy (OSAP) is fairly regarded as the leading venue for publication in ancient philosophy. It is where one looks to find the state-of-the-art. That the serial, which presents itself more as an anthology than as a journal, has traditionally allowed space for lengthier studies, has tended only to add to its prestige; it is as if OSAP thus declares that, since it allows as much space as the merits of the subject require, it can be more entirely devoted to the best and most serious scholarship.' Michael Pakaluk, Bryn Mawr Classical Review

This book explains Aristotelian astronomy, in connection with his cosmology, physics, and metaphysics. A friendly book, in which the reader celebrates the magnificent explanatory graphics. A book matured, coherent, creative, and intense, both profitable by students and scholars.

In Hellenistic Astronomy: The Science in Its Contexts, renowned scholars address questions about what the ancient science of the heavens was and the numerous contexts in which it was pursued.

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.

Galileo’s Dialogue Concerning the Two Chief World Systems, published in Florence in 1632, was the most proximate cause of his being brought to trial before the Inquisition. Using the dialogue form, a genre common in classical philosophical works, Galileo masterfully demonstrates the truth of the Copernican system over the Ptolemaic one, proving, for the first time, that the earth revolves around the sun. Its influence is incalculable. The Dialogue is not only one of the most important scientific treatises ever written, but a work of supreme clarity and accessibility, remaining as readable now as when it was first published. This edition uses the definitive text established by the University of California Press, in Stillman Drake’s translation, and includes a Foreword by Albert Einstein and a new Introduction by J. L. Heilbron.