Gen 1 ESV
14 And God said, “Let there be lights in the expanse of the heavens to separate the day from the night. And let them be for signs and for seasons, and for days and years,
15 and let them be lights in the expanse of the heavens to give light upon the earth.” And it was so. 16 And God made the two great lights—the greater light to rule the day and the lesser light to rule the night—and the stars. 17 And God set them in the expanse of the heavens to give light on the earth, 18 to rule over the day and over the night, and
to separate the light from the darkness. And
God saw that it was good
Genesis 14 "to separate the day from the night"
"The lesser light to rule the night" Genesis
The cycle we experience was established by God on the 4th Creation day. For us. The beautiy we observe in nature
is a witness to the truth of The Bible.