Revelation 6:12

12 When he opened the sixth seal, I looked, and there came a great earthquake; the sun became black as sackcloth, the full moon became like blood,

Revelation 6:12 In-Context

10 they cried out with a loud voice, "Sovereign Lord, holy and true, how long will it be before you judge and avenge our blood on the inhabitants of the earth?"
11 They were each given a white robe and told to rest a little longer, until the number would be complete both of their fellow servants and of their brothers and sisters, who were soon to be killed as they themselves had been killed.
12 When he opened the sixth seal, I looked, and there came a great earthquake; the sun became black as sackcloth, the full moon became like blood,
13 and the stars of the sky fell to the earth as the fig tree drops its winter fruit when shaken by a gale.
14 The sky vanished like a scroll rolling itself up, and every mountain and island was removed from its place.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.