Supra-lunar bodies move circularly. Celestial bodies associated with a different kind of body ether or quintessence.
Fire rises naturally.
Experience in Aristotle demonstrative science can t rely on particular, individual experiences. Hell at the centre of the Aristotelian universe the lowest place. Celestial bodies influence earth. The printing press transformations in the way things were learned about nature. Possibility of scholars in distant places having access to the same text.