ἀναστρόφιος
From LSJ
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
English (LSJ)
ον,
A converse, of mathematical proportions, Papp.210.15, al.
Spanish (DGE)
-ον mat. recíproco λόγος Papp.210.15.