Acts 2:20 - Clarke's commentary and critical notes on the Bible

The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come: The sun shall be turned into darkness, and the moon into blood - These are figurative representations of eclipses, intended most probably to point out the fall of the civil and ecclesiastical state in Judea: see the notes on Matthew 24:29. That the Sun is darkened when a total eclipse takes place, and that the Moon appears of a bloody hue in such circumstances, every person knows.