The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord comes:
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Bede
AD 735
This is believed partly as something which had been done at the Lord's passion, and partly as something to be done in the future.
sun:
This is, as if the power of Christ were hidden, or His doctrine temporarily obscured, or covered by a veil, when the servants of Antichrist are brought to attack the servants of Christ.
moon:
The Church, more than is wont, will shed her blood for Christ
