This book shows that a rigorous study of Aristotle’s Metaphysics is not simply an exercise in the history of astronomy, but constitutes a broad inquiry into our germinal ideas about speed, motion, and the spherical nature of celestial entities, as well as the relation between theology and gnoseology. Many have heard of Aristotle’s First Unmoved Mover, the one that moves all things without being moved. Very few, however, have managed to capture the ultimate meaning of that entity. One of the goals of this book is to explore why the existence of such a First Unmoved Mover is necessary, but...