15 The four angels were freed who had been prepared for that hour and day and month and year, so that they might kill one third of mankind.
The name of the star is called "Wormwood." One third of the waters became wormwood. Many people died from the waters, because they were made bitter. The fourth angel sounded, and one third of the sun was struck, and one third of the moon, and one third of the stars; so that one third of them would be darkened, and the day wouldn't shine for one third of it, and the night in the same way.
Worthy.Bible » Commentaries » Matthew Henry Commentary » Commentary on Revelation 9
Commentary on Revelation 9 Matthew Henry Commentary
Chapter 9
In this chapter we have an account of the sounding of the fifth and sixth trumpets, the appearances that attended them, and the events that were to follow; the fifth trumpet (v. 1-12), the sixth (v. 13-21).
Rev 9:1-12
Upon the sounding of this trumpet, the things to be observed are,
Rev 9:13-21
Here let us consider the preface to this vision, and then the vision itself.