THE SUN AND MOON ARE FOR SIGNS AND SEASONS

The sun and the moon were created for signs, seasons, days and years. In Genesis (Bereishit) 1:14, 16 it is written:

Genesis 1:14 And Elohim said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons <04150>, and for days, and years:

Genesis 1:16 And Elohim made two great lights; the greater light [sun] to rule the day, and the lesser light [moon] to rule the night: he made the stars also.