Revelation 8:11-12

11Now the name of the star is Wormwood; and a third of the waters became wormwood, and many people died from the waters that were made bitter.

12The fourth angel trumpeted, and a third of the sun and a third of the moon and a third of the stars were struck, so that a third of them were darkened. A third of the day would not shine, as well as a third of the night.