Nature

Nature refers to the realm below the orbit of the Moon. The distinction is significant because the Fall of Adam applies only to it, and thus the things in the realm of Nature are subject to change and destruction.

The Sky

The Sky refers to the region of the Universe above the sphere of the orbit of the Moon. Unlike Nature, it is characterized by the fact that everything is perfect and changeless in it.

The First Mover

The First Mover dwells at the most distant celestial sphere. It is responsible for the movement of its sphere, which in turn causes the movement of the sphere below it, and so on. The First Mover moves out of love of God, and tries to imitate His perfection by moving in a perfect shape, the circle.

Astrology

Astrology is the Medieval art which attempts to predict human events through...