'Darkened' in the Bible

Then you must recall the Lord's instructions and the prophetic testimony of what would happen. Certainly they say such things because their minds are spiritually darkened.

Indeed the stars in the sky and their constellations no longer give out their light; the sun is darkened as soon as it rises, and the moon does not shine.

The full moon will be covered up, the bright sun will be darkened; for the Lord who commands armies will rule on Mount Zion in Jerusalem in the presence of his assembly, in majestic splendor.