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ArtistThe celestial spheres, or celestial orbs, were the fundamental entities of the cosmological models developed by Plato, Eudoxus, Aristotle, Ptolemy, Copernicus, and others. In these celestial models, the apparent motions of the fixed stars and planets are accounted for by treating them as embedded in rotating spheres made of an etherial, transparent fifth element (quintessence), like jewels set in orbs. Since it was believed that the fixed stars did not change their positions relative to one another, it was argued that they must be on the surface of a single starry sphere. Building on Empedocles's vision of the world as a four-level cake of stacked fundamental elements - earth, water, air and fire - with fire at the top, Aristotle saw the sublunary world as surmounted by the sphere of fire. The Middle Ages broadly inherited the concept of the four elements of earth, water,
The celestial spheres were key components in ancient cosmological models, representing the movements of stars and planets as embedded in rotating, transparent orbs. This idea, rooted in the belief of fixed stars, merged with the four classical elements—earth, water, air, and fire—creating a layered understanding of the universe, with fire positioned above. The Middle Ages further embraced these elemental concepts.