τούτου δὲ συμβαίνοντος ἀναγκαῖον γίγνεσθαι πάροδον καὶ τροπὰς τῶν ἐνδεδεμένων ἄστρων → but if this were so, there would have to be passings and turnings of the fixed stars
subs.
P. ἰός, ὁ. v. trans. Be spoiled: P. and V. διαφθείρεσθαι.