The Holy Bible, Revelation 16:8-9

8 And the fourth angel poured out his vial upon the sun; and power was given unto him to scorch men with fire.

9 And men were scorched with great heat, and blasphemed the name of God, which hath power over these plagues: and they repented not to give him glory.

The Holy Bible, Revelation 8:12

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.