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Concentric spheres
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==External links== * [https://www.youtube.com/watch?v=_SFzDYSqR_4 Working model and complete explanation of the Eudoxus's Spheres] * [https://web.archive.org/web/20110516145329/http://www.calstatela.edu/faculty/hmendel/Ancient%20Mathematics/Eudoxus/Astronomy/EudoxusHomocentricSpheres.htm Eudoxos of Knidos (Eudoxus of Cnidus): astronomy and homocentric spheres] Henry Mendell, Cal State U, LA * [https://archive.today/20121212204138/http://faculty.fullerton.edu/cmcconnell/Planets.html%233 Models of Planetary Motion—Eudoxus], Craig McConnell, Ph.D., Cal State, Fullerton * [http://classics.mit.edu/Aristotle/heavens.1.i.html Aristotle's ''On the Heavens''] * [http://classics.mit.edu/Aristotle/metaphysics.html Aristotle's ''metaphysics''] [[Category:Ancient Greek astronomy]] [[Category:Early scientific cosmologies]]
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