Topsy-Turvy World: Circular Motion, Contrariety, and Aristotle’s Unwinding Spheres

@inproceedings{Noble2013TopsyTurvyWC,
  title={Topsy-Turvy World: Circular Motion, Contrariety, and Aristotle’s Unwinding Spheres},
  author={Christopher Isaac Noble},
  year={2013}
}
In developing his theory of aether in De Caelo 1, Aristotle argues, in DC 1.4, that one circular motion cannot be contrary to another. In this paper, I discuss how Aristotle can maintain this position and accept the existence of celestial spheres that rotate in contrary directions, as he does in his revision of the Eudoxan theory in Metaphysics 12.8.