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
hēlĭŏtrŏpĭos, ĭī, m., héliotrope (pierre précieuse) : Capel. 1, 75.