•Heavens composed of “perfect” fifth element
–Elements: Earth, Air, Fire, Water, Quintessence
–Heavens
are unchanging except for rotation:
•Motion produced by multiple nested spheres
–Rotate at
constant rate
–Are offset and inclined in ways to produce motion of planets
–Our
“Celestial Sphere” of stars is just the outermost of many he had. VERY complicated for a “perfect” system!