File:Eudoxus' Homocentric Spheres.png

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English: 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
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Author Thehopads

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9 June 2018

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current22:52, 15 August 2018Thumbnail for version as of 22:52, 15 August 20181,920 × 1,080 (1.11 MB)ThehopadsUser created page with UploadWizard

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