Revelation 6:12. "And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood", and, Joel 2:31, "The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the Lord come", and, Acts 2:20, "The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come"