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 the journey to this end allows us to understand why Aristotle maintained that there are a total of 55 Unmoved Movers, not just one. The key is Aristotelian astronomy, little studied so far in comparison with other aspects of his thought. In this solid piece of research and free philosophical speculation that Botteri & Casazza offer us, the authors’ gaze raised to the sky—by means of the naked-eye analysis of celestial movements—leads to the reconstruction of Aristotle’s astronomical system, key to understanding his cosmology, his physics, and even his metaphysics.

This book is a revised English translation from the original Spanish publication El sistema astronómico de Aristoteles: Una interpretación, published by Ediciones Biblioteca Nacional, Buenos Aires, 2015.