The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord comes:
All Commentaries on Acts 2:20 Go To Acts 2
Augustine of Hippo
AD 430
the Church, shall be darkened, because in those tremendous temptations and tribulations which shall be in the end of the world, many who had seemed as bright and as firm as the sun and the stars shall fall from the faith.