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Ptolemy's Planetary Mean Motions Revisited

Identifieur interne : 001A68 ( Main/Exploration ); précédent : 001A67; suivant : 001A69

Ptolemy's Planetary Mean Motions Revisited

Auteurs : Alexander Jones [Canada] ; Dennis Duke [États-Unis]

Source :

RBID : ISTEX:AF91E77B6B1FC1DD1CB16CB9BC8EAB28908C8945

Abstract

Abstract.  Ptolemy provides two explanations of the origin of his highly precise planetary mean motions in the Almagest, asserting in one set of passages that they were obtained directly from analysis of pairs of observations widely spaced in time, but in another passage that they were derived from period relations expressed as corrections to the well‐known Babylonian Goal‐Year periods. We show that the latter account is true. Moreover, while some of these period relations may have themselves been calibrated through the observations that Ptolemy cites, those for Mercury and Saturn can be shown to have had a different origin.

Url:
DOI: 10.1111/j.1600-0498.2005.470303.x


Affiliations:


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Le document en format XML

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