Revelation 8:11-12

11The name of the star is Wormwood, and a third of the waters became wormwood. So, many of the people died from the waters, because they had been made bitter.

12The fourth angel blew his trumpet, 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 was without light and also a third of the night.