Thematic Bible: Fourth day, placing the sun, moon, and stars to give light, &c

Then God said, "Let there be lights across the sky to distinguish day from night, to act as signs for seasons, days, and years, to serve as lights in the sky, and to shine on the earth!" And that is what happened: God fashioned two great lights the larger light to shine during the day and the smaller light to shine during the night as well as stars. read more.
God placed them in space to shine on the earth, to differentiate between day and night, and to distinguish light from darkness. And God saw how good it was. The twilight and the dawn were the fourth day.