ἔξαυγος
From LSJ
οὗτος μὲν ὁ πιθανώτερος τῶν λόγων εἴρηται, δεῖ δὲ καὶ τὸν ἧσσον πιθανόν, ἐπεί γε δὴ λέγεται, ῥηθῆναι → this is the most credible of the stories told; but I must relate the less credible tale also, since they tell it
English (LSJ)
ον, not ὕπαυγος, i.e. more than fifteen degrees from the sun, Olymp. in Mete.56.2, Porph. ap. Heph.Astr.2.18, Steph.in Hp.2.363D.
Spanish (DGE)
-ον
1 astr. no alcanzado por el brillo solar de cuerpos celestes distantes más de quince grados del sol ὁ δὲ Ζεὺς σὺν Ἡλίῳ, εἰ μὲν ὕπαυγος εἴη ... εἰ δὲ ἔ. Vett.Val.378.26, cf. Heph.Astr.2.18.18, Doroth.344.12, πλάνητες Olymp.in Mete.56.2, ὁ κύων Steph.in Hp.Aph.2.104.17.
2 translúcido λίθος τοπάζιος ... ἔ. καθὰ καὶ ὁ κρύσταλλος Orph.L.Ker.8.4.