"It has been ten years since I published my Commentaries on the Movements of the Planet Mars. As only a few copies of …"

"[A] comparison was undertaken between this book—or the related work On the Harmonies...—and Aristotle's books ' and M…"

"Aristotle is the man... who in On the Heavens... Chapter 9... asks: "Do the stars give forth sounds which are modulat…"

"I... led on by... thirst for philosophy, first wiped away from the eyes of astronomy those mists of the multiplicity …"

"Then, as in each and every planet there is a very fast movement and a very slow movement and in a fixed proportion...…"

"Aristotle... in the Metaphysics, Book XII, Chapter 8... built... the most sublime part of his philosophy... concernin…"

"As regards the academies, they are... concerned not to have the program of teaching change very often... the things w…"

"[T]he truth concerning the mutable nature of the heavens can be taught conveniently... [I]t is not without its use in…"

"You can count few academies in which it is a part of the program to explain the Metaphysics of Aristotle: yet Aristot…"

"Astronomers should not be granted excessive license to conceive anything they please without reason: on the contrary,…"