εἰ ἀποκρυπτόντων τῶν Μήδων τὸν ἥλιον ὑπὸ σκιῇ ἔσοιτο πρὸς αὐτοὺς ἡ μάχη καὶ οὐκ ἐν ἡλίῳ → if the Medes hid the sun, the battle would be to them in the shade and not in the sun
SourceFrench (Bailly abrégé)
2ᵉ sg. impér. ao.2 de γιγνώσκω.
Greek Monotonic
γνῶθι: προστ. αορ. βʹ του γιγνώσκω.