Stars are the spherical object according to Aristotle's geocentric model.
Aristotle's model of the universe was also geocentric in which the Sun, Moon, planets, and stars all orbiting the Earth and present inside of Eudoxus' spheres and also revolves around the planet earth.
Aristotle believed in a geocentric Universe and that the planets and stars were perfect spheres, but the Earth itself was not a perfect sphere so we can conclude that Stars are the spherical object according to Aristotle's geocentric model.
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