Models of the Universe: Ptolemaic
	Structure Coelum empyraeum (empyrean)--God is here. Not a sphere. 9 to 11 concentric spheres, usually these: l Primum mobile (prime mover)--regulates the inner spheres; 4 elements mixed perfectly; eternal, immutable, air=pure ether [alternative theory made ether 5th element) l Fixed stars l Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon l Sublunary region--beneath the moon, this is the earth; 4 elements mixed imperfectly, subject to decay, mutable, air=thick and dirty