A New Role for the Hippopede ofEudoxus

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The geometry of the alternative reconstruction of Eudoxan planetary theory is studied. It is shown that in this framework the hippopede acquires an analytical role, consolidating the theory's geometrical underpinnings. This removes the main point of incompatibility between the alternative reconstruction and Simplicius's account of Eudoxan planetary astronomy. The analysis also suggests a compass and straight-edge procedure for drawing a point by point outline of the retrograde loop created by any given arrangement of the three inner spheres.

Original languageEnglish
Pages (from-to)69-93
Number of pages25
JournalArchive for History of Exact Sciences
Issue number1
StatePublished - 2001


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