Parallel
Joel 2:31
Swete's Septuagint · Berean Standard Bible
ὁ ἥλιος μεταστραφήσεται εἰς σκότος καὶ ἡ σελήνη εἰς αἵμα πρὶν ἐλθεῖν ἡμέραν Κυρίου τὴν μεγάλην καὶ ἐπιφανῆ·
The sun will be turned to darkness and the moon to blood before the coming of the great and awesome (note: Or dreadful; LXX glorious) Day of the LORD.