The Bible

Genesis 1:18

¹⁸ And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.

Commentary

Open

'To open,' as in Revelation 9, signifies communication and conjunction.

(References: Apocalypse Explained 537)

The Bible

Joel 2:31

³¹ The sun will be turned into darkness, and the moon into blood, before the great and terrible day of Yahweh comes.