“But in those days, after that suffering, ¹  the sun will be darkened and the moon will not give its light;

let their eyes be darkened so that they may not see, and make their backs bend continually.” ¹ 

They are darkened in their understanding, ¹  being alienated from the life of God because of the ignorance that is in them due to the hardness of their hearts.

“Immediately ¹  after the suffering ²  of those days, the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of heaven will be shaken. ³ 

For although they knew God, they did not glorify him as God or give him thanks, but they became futile in their thoughts and their senseless hearts ¹  were darkened.

He ¹  opened the shaft of the abyss and smoke rose out of it ²  like smoke from a giant furnace. The ³  sun and the air were darkened with smoke from the shaft.

Then ¹  the fourth angel blew his trumpet, and a third of the sun was struck, and a third of the moon, and a third of the stars, so that a third of them were darkened. And there was no light for a third of the day ²  and for a third of the night likewise.