On the Heavens
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On the Heavens is Aristotle's chief cosmological treatise: written in 350 BCE, it contains his astronomical theory and his ideas on the concrete workings of the terrestrial world. It should not be con
Thomas Aquinas and Averroes
Sublunary sphere
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In Aristotelian physics and Greek astronomy, the sublunary sphere is the region of the geocentric cosmos below the Moon, consisting of the four classical elements: earth, water, air, and fire.
The seven heavens and the sublunar spheres, from an engraving of Albertus Magnus' Philosophia naturalis
