Hence, inasmuch as the Galaxy is an effect of those stars which we cannot see, but comprehend by their effects, and Metaphysics treats of first substances, which likewise we cannot comprehend except by their effects, it is manifest that the starry heaven has great resemblance to Metaphysics. Still further, by the pole which we see it signifies things obvious to sense, of which, taking them as a whole, Physics treats; and by the pole which we do not see it signifies the things which are immaterial, which are not obvious to sense, of which Metaphysics treats; and therefore the aforesaid heaven bears a great resemblance to both these sciences. Still further, by its two movements it signifies these two sciences; for, by the movement in which it revolves daily and makes a new circuit from point to point, it signifies the corruptible things in nature, which daily complete their course, and their matter is changed from form to form; and of this Physics treats; and by the almost insensible movement which it makes from west to east of one degree in a hundred years, it signifies the things incorruptible, which had from God the beginning of existence, and shall never have an end; and of these Metaphysics treats.” ↩