https://www.bible.com/bible/55/GEN.1.14.drc1752From Genesis 1:7 (Douay Rheims, Bishop Challoner version)
"And God made a firmament, and divided the waters that were under the firmament from those that were above the firmament."
We'll jump ahead a little bit to Genesis 1:14 - 1:18:
1:14
"And God said: Let there be lights in the firmament of heaven, to divide the day and the night, and let them be signs, and for seasons, and for days and years."
1:15
"To shine in the firmament of heaven, and to give light upon the earth. And it was done.
1:16
"And God made two great lights: a greater light to rule the day, and a lesser light to rule the night: and the stars."
1:17
"And he set them in the firmament of heaven to shine upon the earth."
1:18
"And to rule the day and the night, and to divide the light and the darkness. And God saw that it was good."