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Archivo: Eudoxus' Homocentric Spheres

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Description: Eudoxus' model of planetary motion. Each of his homocentric spheres is represented here as a ring which rotates on the axis shown. The outermost (yellow) sphere rotates once per day; the second (blue) describes the planat's motion through the zodiac; the third (green) and fourth (red) together move the planet along a figure-eight shape (or hippopede) to explain retrograde motion. As explained at https://www.thehistoryofphysics.org
Title: Eudoxus' Homocentric Spheres
Credit: Own work
Author: Thehopads
Usage Terms: Creative Commons Attribution 4.0
License: CC BY 4.0
License Link: https://creativecommons.org/licenses/by/4.0
Attribution Required?: Yes

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