Acts 2:20 describes cosmic signs, darkening of the sun and blood-red moon, that will come just before the great and glorious day of the Lord. Peter says this in his first sermon on the day of Pentecost, quoting the prophet Joel to a crowd in Jerusalem that included Jews from many nations.
The sun will be turned into darkness, and the moon into blood, before the great and glorious day of the Lord comes.
Acts 2:20 (WEB)
What Acts 2:20 Means
The verse uses the language of dramatic upheaval. When the sun goes dark and the moon turns to blood, the sky itself seems to be unraveling. Ancient readers would have recognized this as the imagery of God acting decisively in history, a sign that the ordinary order of things is being interrupted by his purpose.
The phrase “the great and glorious day of the Lord” points to a decisive moment of judgment and deliverance that the Old Testament prophets often described. Peter is saying that what the crowd is witnessing, the Spirit poured out on ordinary people, is connected to that larger plan, and that God’s future action is already underway.
The verse does not give a timetable or a calendar for these events. It also does not tell you to look for eclipses or blood moons as personal signals. Its point is that God is in control of history and will bring his purposes to completion.
The Context of Acts 2:20
Luke wrote the book of Acts as a second volume to his Gospel, addressed to a man named Theophilus. Traditionally, Luke is identified as a companion of Paul, and the book traces the spread of the gospel from Jerusalem outward. The first audience was largely Jewish, gathered for the feast of Pentecost, and Peter speaks directly to them as “men of Israel.”
The verses just before and after frame the quotation. Verses 17 to 19 describe the outpouring of God’s Spirit on all people, and verse 21 promises that whoever calls on the Lord will be saved. Peter’s quotation of Joel moves from the wonders in the sky to a gracious invitation, and that shift matters. The signs are not only warnings. They sit alongside a promise that salvation is open to anyone who calls on God’s name.
Key Phrases in Acts 2:20
Joel 2:31
The sun will be turned into darkness, and the moon into blood, before the great and terrible day of the LORD comes.
(WEB)
This is the prophetic text that Peter is quoting. Reading the original context in Joel helps you see how the sun and moon imagery fits into a broader call to repentance and a promise of God’s mercy.
Acts 2:21
It will be that whoever will call on the name of the Lord will be saved.’
(WEB)
The verse immediately following the quotation gives the promise that makes the signs meaningful. It shows that the day of the Lord is not only a day of judgment but also a day when anyone who calls on his name can be saved.
A Short Prayer From Acts 2:20
Lord, you hold the sun and the moon in your hands and you govern every season of history. When the world feels unsettled, help me to remember that you are not surprised by anything that happens. Steady my heart as I wait for the day you have promised. Let my eyes be fixed on you rather than on the uncertainty around me, and give me a clear call to trust you today. Thank you for the promise that whoever calls on your name will be saved. Amen.
