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- W123587909 abstract "PtolemyPtolemy , as is well known, devoted the great part of his Almagest (properly, Mathematical Composition) to modelling the motions of the Sun, Moon, and planets by means of combinations of circular motions that are represented in his geometrical analyses by two-dimensional assemblages of circles, straight lines, and points. It is a little less well known that his later work, the Planetary Hypotheses, proposed systems of three-dimensional bodies, composed of ether (αἰθήρ, the Aristotelian fifth, celestial element) and having spherical and planar surfaces, that were supposed to be the physical realities performing the various revolutions that the Almagest’s circles describe geometrically. The three-dimensional, physical cosmology of the Planetary Hypotheses was not an abrupt innovation that PtolemyPtolemy imposed after the fact on the geometrical theories he worked out the Almagest. Its foundations include assumptions expressed, albeit sometimes briefly and in passing, in the Almagest and in works that PtolemyPtolemy composed before the Almagest, as well as ideas that were already current in Platonist and Peripatetic philosophy before PtolemyPtolemy ’s time, for which we have a valuable witness in the one surviving work by the Platonist philosopher Theon of SmyrnaTheon of Smyrna . This paper attempts to delineate some of this background and to show what elements were indeed new in the Planetary Hypotheses." @default.
- W123587909 created "2016-06-24" @default.
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- W123587909 date "2015-01-01" @default.
- W123587909 modified "2023-09-26" @default.
- W123587909 title "Theon of Smyrna and Ptolemy on Celestial Modelling in Two and Three Dimensions" @default.
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- W123587909 doi "https://doi.org/10.1007/978-3-319-12102-4_4" @default.
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