Acts 2:20

20 the sun shall be turned into darkness, and the moon into blood before that great and notable day of the Lord shall come;

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 and for certain on my slaves and on my handmaids I will pour out in those days of my Spirit, and they shall prophesy;

19 and I will show wonders in heaven above, and signs in the earth beneath: blood, and fire, and vapour of smoke;

20 the sun shall be turned into darkness, and the moon into blood before that great and notable day of the Lord shall come;

21 and it shall come to pass that whosoever shall call on the name of the Lord shall be saved.

22 Ye men of Israel, hear these words: Jesus of Nazareth, a man approved of God among you by miracles and wonders and signs, which God did by him in the midst of you, as ye yourselves also know,