On "the day of the Lord" there will be earthquakes, the sun and the moon will be dark, and the stars will no longer shine.
2:10
"The sun shall be turned into darkness, and the moon into blood."
These "signs" were a lot more impressive before the causes of solar and lunar eclipses
were understood. 2:31
"The sun and the moon shall be darkened, and the stars shall withdraw their shining." 3:15
The Lord will roar and the heavens and earth will shake. 3:16
