'Dark' in the Bible

When the Lamb broke the sixth seal I looked, and there was a great earthquake, and the sun became as dark as sackcloth, and the whole disc of the moon became like blood.

When the fourth angel blew his trumpet, one-third of the sun, one-third of the moon, and one-third of the stars were struck so that one-third of them turned dark. One-third of the day was kept from having light, as was the night.

And he made the great deep open and a smoke went up from it, like the smoke of a great oven; and the sun and the air were made dark because of the smoke.

Now this is what the horses and their riders looked like in my vision: The riders had breastplates that were fiery red, dark blue, and sulfurous yellow in color. The heads of the horses looked like lions' heads, and fire, smoke, and sulfur came out of their mouths.

And the fifth let what was in his vessel come out on the high seat of the beast; and his kingdom was made dark; and they were biting their tongues for pain.