In the world of Celestial Matters, Ptolemaic astronomy and Aristotelian physics are valid scientific models of the surrounding world and cosmos The Earth lies at the center of the universe, surrounded by crystal spheres which hold each of the planets, the sun and the moon, all enclosed in the sphere of the fixed stars Earthly matter, composed of the classical four elemen In the world of Celestial Matters, Ptolemaic astronomy and Aristotelian physics are valid scientific models of the surrounding...
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