'Darkness' in the Bible

the sun shall be turned to darkness, and the moon to blood, before the coming of the day of the Lord -- the great and illustrious;

and now, lo, a hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season;' and presently there fell upon him a mist and darkness, and he, going about, was seeking some to lead him by the hand;

to open their eyes, to turn them from darkness to light, and from the authority of the Adversary unto God, for their receiving forgiveness of sins, and a lot among those having been sanctified, by faith that is toward me.