# De utilitate mathematicae 191

Theon Smyrnaeus, De utilitate mathematicae, Paragraph 191. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/theon-smyrnaeus/de-utilitate-mathematicae/191

τὰ δʼ ἄλλα πλανητὰ ἐπειδὴ κατὰ πάντα τόπον τοῦ ζῳδιακοῦ καὶ μέγιστα καὶ ἐλάχιστα καὶ μέσα ποιεῖται καὶ ἀποστήματα καὶ κινήματα, ἐὰν κέντρῳ μὲν τῷ θ τοῦ παντός, διαστήματι δὲ τῷ θκ, γεγράφθαι νοήσω- μεν κύκλον τὸν κπρ, ἔπειτα τοῦτον, ἔγκεντρον ὄντα καὶ ἴσον τῷ τῆς ἑτέρας ὑποθέσεως ἐπικύκλῳ, φέρεσθαι περὶ τὸ θ τοῦ παντὸς κέντρον καὶ συναποφέρειν τὸ κ κέν- τρον τοῦ ἐκκέντρου ὑπεναντίως τῷ παντὶ ἐν χρόνῳ τινί, τὸν δὲ ελυξ ἔκκεντρον ἐν ἑτέρῳ χρόνῳ κινεῖσθαι περὶ τὸ ἑαυτοῦ κέντρον τὸ κ, φέροντα τὸν πλανώμενον ἐνεστηριγμένον ἐν αὐτῷ κατὰ τὸ ε, λαμβανομένων τῶν χρόνων καθʼ ἕκαστον τῶν πλανωμένων ἰδίων καὶ οἰκείων, σωθήσεται τὰ φαινόμενα.

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Theon Smyrnaeus, De utilitate mathematicae, ed. Eduardus Hiller. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg1724.tlg001.local001/.