Revelation 8:11-12

11The name of the star is Wormwood. A third of the waters became wormwood, and many men died from the water, because it was made bitter.

12Then the fourth angel sounded: And a third of the sun was struck, a third of the moon, and a third of the stars, so that a third of them were darkened. A third of the day did not shine, and likewise the night.