Fialon refers to Aristotle (De Cœlo. i. 5) on the non-infinitude of the circle. The conclusion is ῞Οτι μὲν οὖν τὸ κύκλῳ κινούμενον οὐκ ἔστιν ἀτελεύτητον οὐδ᾽ ἄπειρον, ἀλλ᾽ ἔχει τέλος, φανερόν