On the Heavens

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Is a seminal work in ancient Greek philosophy and cosmology, written around 350 B.C.E. In this treatise, Aristotle presents his astronomical theories and ideas about the physical structure of the universe1. He argues that the heavens are composed of a perfect, unchanging substance called aether, distinct from the four classical elements (earth, water, air, fire) that make up the terrestrial world1. Aristotle also proposes a geocentric model of the universe, with the Earth at its center, and describes the motions of celestial bodies as eternal and circular, reflecting their perfect nature

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philosophycosmologyastronomicalgeocentric model