# Elementa astronomia 27-2

Geminus, Elementa astronomia, Cap. V. Περὶ τῶν ἐν τῇ σφαίρᾳ κύκλων.. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/geminus/elementa-astronomia/27-2

Ὁ δὲ χειμερινὸς τροπικὸς κύκλος ὑπὸ τοῦ ὁρίζοντος τέμνεται οὕτως, ὥςτε τὸ μὲν ἔλασσον τμῆμα ὑπὲρ γῆν γίνεσθαι, τὸ δὲ μεῖζον ὑπὸ γῆν. ἡ δ’ ἀνισότης τῶν τμημάτων τὴν αὐτὴν παραλλαγὴν ἔχει ἐπὶ πάντων τῶν κλιμάτων, ἥτις ἐγίνετο καὶ ἐπὶ τοῦ θερινοῦ τροπικοῦ κύκλου· διὰ παντὸς γὰρ τὰ ἐναλλὰξ τμήματα τῶν τροπικῶν κύκλων ἴσα ἀλλήλοις ἐστί. δι’ ἣν αἰτίαν ἡ μεγίστη c ἡμέρα ἴση ἐστὶ τῇ μεγίστῃ νυκτί, καὶ ἡ ἐλαχίστη ἡμέρα ἴση ἐστὶ τῇ ἐλαχίστῃ νυκτί.

---

Geminus, Elementa astronomia, ed. Charles Manitius. 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/tlg1383.tlg001.local001/.