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A passage from Theon’s  Expositio  reveals the systematic exegesis of Aristotle’s cosmology provided by Adrastus. By referring to the  De caelo , Adrastus affirms the importance of the fifth element for the physical model of heavenly motion. This is the ground for his reading of  Metaphysics  Λ, which is focused on counteracting spheres: Adrastus aims to reconcile the homocentric model with the epicycle one. This exegesis must be seen in the wider context of the Peripatetic debate on astronomical topics: Adrastus shows a strict allegiance to Aristotle, who ought to be considered the only real  auctoritas  for him.

Adrastus on Aristotle’s Cosmology The Peripatetic Exegesis of De Caelo and Metaphysics Λ