The Bible

 

Genesis 1:6

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6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.

The Bible

 

Nehemiah 9:6

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6 Thou, even thou, art LORD alone; thou hast made heaven, the heaven of heavens, with all their host, the earth, and all things that are therein, the seas, and all that is therein, and thou preservest them all; and the host of heaven worshippeth thee.

Commentary

 

Great lights

  

Great lights, as in luminaries, signify love and faith, and are called in Genesis 1:14-17 the sun, moon, and stars.

(References: Arcana Coelestia 31 [1-3])