Revelation 8:12-13

12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise.
13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!

Revelation 8:12-13 Meaning and Commentary

INTRODUCTION TO REVELATION 8

This chapter contains the opening of the seventh seal, and the things that followed on it, and particularly the sounding of the first four trumpets. Upon the opening of the seventh seal there was silence in heaven for half an hour, Re 8:1; then follows a vision of seven angels, who stood before God, and had seven trumpets given to them, Re 8:2; then of another angel, described by his position, standing at the altar; by his having a golden censer, and by much incense being given him, the end of which was to offer up the prayers of all saints, which with it went up to God, and were acceptable to him; and by filling his censer with the fire of the altar, and casting it to the earth; the effects of which were voices, thunderings, lightnings, and an earthquake, Re 8:3-5, after which the seven angels prepare to sound their trumpets, Re 8:6; the first blows his, which brings hail and fire, mingled with blood, upon the earth, which burns up the third part of trees and all green grass, Re 8:7; the second blows, upon which a burning mountain is cast into the sea, and a third part of it becomes blood, a third part of the creatures in it die, and a third part of the ships upon it are destroyed, Re 8:8,9; the third angel blows; upon which a star, like a burning lamp, falls upon the third part of rivers and fountains, whose name is Wormwood, and embitters them, so that many men die of them, Re 8:10,11; the fourth angel blows, and the third part of the sun, moon, and stars, is smitten, and becomes dark, so that there is no light for a third part of the day and night, Re 8:12; and the chapter is concluded with the vision of another angel flying through the midst of heaven, proclaiming three times woe to the inhabitants of the earth, on account of what would be uttered by the three following angels, who were yet to blow their trumpets, Re 8:13.

Revelation 8:12-13 In-Context

10 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;
11 And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise.
13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!
The King James Version is in the public domain.