# De utilitate mathematicae 158

Theon Smyrnaeus, De utilitate mathematicae, Paragraph 158. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/theon-smyrnaeus/de-utilitate-mathematicae/158

ἔτι τῶν μὲν ἄλλων κύκλων ἕκαστος ὄντως ἐστὶ κύ- κλος ὑπὸ μιᾶς γραμμῆς περιεχόμενος. ὁ δὲ λεγόμενος ζῳδιακὸς ἐν πλάτει τινὶ φαίνεται καθάπερ τυμπάνου κύκλος, ἐφʼ οὗ καὶ εἰδωλοποιεῖται τὰ ζῴδια. τούτου δὲ ὁ μὲν διὰ μέσου λέγεται τῶν ζῳδίων, ὅστις ἐστὶ καὶ μέγιστος καὶ τῶν τροπικῶν ἐφαπτόμενος καθʼ ἓν ἑκα- τέρου σημεῖον καὶ τὸν ἰσημερινὸν διχοτομῶν· οἱ δὲ ἑκατέρωθεν τὸ πλάτος ἀφορίζοντες τοῦ ζῳδιακοῦ καὶ τοῦ διὰ μέσου ἐλάττονες.

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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/.