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Aristotle's account of place, in which he defined a thing's place as the inner surface of its nearest immobile container, was supported by the Latin Middle Ages, even 1600 years after his death, though it had not convinced many ancient Greek philosophers. The sixth century commentator Philoponus took a more common-sense view. For him, place was an immobile three-dimensional extension, whose essence did not preclude its being empty, even if for other reasons it had always to be filled with body. However, Philoponus reserved his own definition for an excursus, already translated in this series, The Corollary on Place. In the text translated here he wanted instead to explain Aristotle's view to elementary students. The recent conjecture that he wished to attract young fellow Christians away from the official pagan professor of philosophy in Alexandria has the merit of explaining why he expounds Aristotle here, rather than attacking him. But he still puts the students through their paces, for example when discussing Aristotle's claim that place cannot be a body, or two bodies would coincide. Philoponus has been identified as the founder in dynamics of the theory of impetus, an inner force impressed from without, which, in its later recurrence, has been hailed as a scientific revolution. His commentary is translated here without the previously translated excursus, the Corollary on Void, also available in this series. Philoponus rejects Aristotle's attack on the very idea of void and of the possibility of motion in it, even though he thinks that void never occurs in fact. Philoponus' argument was later to be praised by Galileo. Philoponus' commentary on the last part of Aristotle's Physics Book 4 does not offer major alternatives to Aristotle's science, as did his commentary on the earlier parts, concerning place, vacuum and motion in a vacuum. Aristotle's subject here is time, and his treatment of it had led to controversy in earlier writers. Philoponus does offer novelties when he treats motion round a bend as in one sense faster than motion on the straight over the same distance in the same time, because of the need to consider the greater effort involved. And he points out that in an earlier commentary on Book 8 he had argued against Aristotle for the possibility of a last instant of time.

Physics --- Philosophy. --- Aristotle. --- Aristoteles. --- Science, Ancient --- Time --- Sciences anciennes --- Physique --- Temps --- Early works to 1800. --- Ouvrages avant 1800 --- Philosophy of nature --- Aristotle --- Physics. --- Aristoteles; Physikē akroasis 4, 10-14. --- Philoponus, John, --- In Aristotelis Physicorum commentaria (Philoponus, John). --- Physics (Aristotle). --- Metaphysics --- Métaphysique --- Early works to 1800 --- Physics - Early works to 1800 --- Philosophy of nature - Early works to 1800 --- Aristotle. - Physics --- Philosophie. --- Aristote --- Philosophy --- Aristotle. Physics. --- Philosophy of nature.