# Optica ιγ΄.

Euclid, Optica, ιγ΄.. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/euclid/optica/%CE%B9%CE%B3%CE%84.

Τῶν ἴσων μεγεθῶν καὶ ὑπὸ τὸ αὐτὸ ὄμμα κειμένων τὰ πόρρω μετεωρότερα φαίνεται. ἔστω ἴσα μεγέθη τὰ ΑΒ, Γ∠, ΕΖ, ὄμμα δὲ ἔστω τὸ Η μετεωρότερον κείμενον τῶν μεγεθῶν, καὶ προσπιπτέτωσαν ἀκτῖνες αἱ ΗΑ, ΗΓ, ΗΕ. λέγω, ὅτι τὸ ΑΒ τοῦ Γ∠ μετεωρότερον φαίνεται, τὸ δὲ ΓΔ τοῦ ΕΖ. ἐπεὶ γὰρ ἡ ΗΑ τῆς ΗΓ ἐστι μετεωροτέρα, ἡ δὲ ΗΓ τῆς ΗΕ, καὶ ἐν ᾧ εἰσιν αἱ ΗΑ, ΗΓ ΗΕ, ἐν τούτῳ ἐστὶ καὶ τὰ Α, Γ. Ε σημεῖα, ἐν ᾧ δὲ τὰ Α, Γ, Ε, ἐν τούτῳ καὶ τὰ ΑΒ, Γ∠, ΕΖ μεγέθη, τὸ ΑΒ ἄρα τοῦ Γ∠ μετεωρότερον φαίνεται, τὸ δὲ Γ∠ τοῦ ΕΖ.

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Euclid, Optica, ed. Johan Ludvig Heiberg, Heinrich Menge. 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/tlg1799.tlg009.local001/.