Acts 2:20

20 the sun turning black and the moon blood-red, Before the Day of the Lord arrives, the Day tremendous and marvelous;

Acts 2:20 Meaning and Commentary

Acts 2:20

The sun shall be turned into darkness
As at the death of Christ, by a total eclipse of it:

and the moon into blood;
as at the opening of the sixth seal, ( Revelation 6:12 )

before that great and notable day of the Lord come;
when he shall come in power and great glory, as he did in a few years after this, to take vengeance on the Jews, and destroy their nation, city, and temple; in which there was a display of his greatness, and power, and which was awful and "terrible" to them, as in Joel it is called; (See Gill on Matthew 24:29).

Acts 2:20 In-Context

18 When the time comes, I'll pour out my Spirit On those who serve me, men and women both, and they'll prophesy.

19 I'll set wonders in the sky above and signs on the earth below, Blood and fire and billowing smoke,

20 the sun turning black and the moon blood-red, Before the Day of the Lord arrives, the Day tremendous and marvelous;

21 And whoever calls out for help to me, God, will be saved."

22 "Fellow Israelites, listen carefully to these words: Jesus the Nazarene, a man thoroughly accredited by God to you - the miracles and wonders and signs that God did through him are common knowledge -