Revelation 8:11-12

11The name of the star is Wormwood. A third of the waters became wormwood, and many people died from the water, because it had been made bitter. 12The 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 their light might be darkened, and a third of the day might be kept from shining, and likewise a third of the night.