"And our moon is the perfect size and distance from the Earth for its gravitational pull. The moon creates important ocean tides and movement so ocean waters do not stagnate, and yet our massive oceans are restrained from spilling over across the continents." ES
And God 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, and for days,
and years: And God made two great lights; the greater light to rule the day, and the lesser
light to rule the night: he made the stars also.
Genesis 1:14,16