Joel 2:30-31

The Lord also promised awesome displays of celestial phenomena before this great and terrible day of the Lord arrived. Awe-inspiring miracles would occur in the sky as well as on the earth. The appearance of blood, fire, and columns of smoke suggests warfare, with God’s hand at work behind the scenes (cf. Exodus 19:9; Exodus 19:16-18; Revelation 6:12-17). The sun would become dark and the moon would turn red. These are probably descriptions of how these heavenly bodies will look (language of appearance), not what will become of them, in view of other similar descriptions (e.g., Joel 2:2; Joel 2:10; Joel 3:15; Jeremiah 4:23-24; Ezekiel 32:6-8; Amos 5:18-20; Amos 8:9; Zephaniah 1:15; Revelation 6:12-13). These signs will precede the great and awesome day of the Lord still future (cf. Matthew 24:29-31; Mark 13:24-27; Luke 21:25-28).