why do things move the way they do?
The Origin of Motion
why is the bird flying? to find food
why is the stone falling? because socrates threw it
why is the tree growing? to get more light on its leaves
The Nature of Motion (things move for a reason)
The center of the Earth is a privileged spatial position: motion is either toward, away, or around the center
Motion and the Earth
the universe is a finite sphere; earth is surrounded by concentric sphere (one for each element)
Aristotelian Cosmology