Revelation 8:12-13 - The Fourth Trumpet
12 [When] the fourth angel sounded its trumpet [I saw] one third of the sun, one third of the moon, and one third of the stars being struck, so that one third [of their light] would become darkened. So, the daytime had [only] one third of its [normal] light, and the nighttime was the same way.
13 And as I looked, I heard an eagle flying in midair, saying in a loud voice, "It is bad, very bad, awful bad for those people who live on earth, because of the sound of the trumpets of the remaining three angels!" [i.e., because of the messages they will deliver].