Revelation 8:11-12

11That star was named Wormwood. One-third of the water turned into wormwood, and many people died from this water because it had turned bitter.

12When 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. There was no light for one-third of the day and one-third of the night.