ἔξαυγος
From LSJ
χαῖρ', ὦ μέγ' ἀχρειόγελως ὅμιλε, ταῖς ἐπίβδαις, τῆς ἡμετέρας σοφίας κριτὴς ἄριστε πάντων → all hail, throng that laughs untimely on the day after the festival, best of all judges of our poetic skill
English (LSJ)
ἔξαυγον, 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.