God purposefully made the moon.
Dr. James J. S. Johnson
God made the moon to rule the nighttime, just as is clearly reported in Genesis. (See Genesis 1:14-18; Psalm 104:19 & 136:9; Ezekiel 32:7.) But how and why did God make the moon, such as how does it “rule” the nighttime? By His own command By His own command, on Day #4, God made the moon to give light, especially light to help us (and to help animals) to see, during nighttime on Earth.
Also, the moon “rules” many activities on Earth due to the moon’s gravitational pull (in combination with the sun’s similar gravitational pull) on the earth and on its inhabitants, such as animals and people, and even on the waters of the oceans — producing the repeating and rhythmic movements of the oceans that we call “tides”. This action of “ruling” can be compared to a speed-limiting “governor” installed on a truck’s engine; the truck engine’s “governor” is not a person but it forcefully and controls the behavior of the engine in a way that limits the speed of the truck, to accomplish the intentions of the clever inventor who designed the truck engine’s “governor”.
In a similar (yet much superior) way, God cleverly invented the moon’s gravitational traits, with the intention that the moon’s gravity limits various activities on Earth, via the moon’s complicated movements and their related gravitational attractions on the earth (in relation to interrelated and complicated motions of the sun and earth), from different directions at different times — resulting in an ongoing choreography of gravitational attractions between those heavenly bodies. The moon’s periodic movements, as the moon moves around the earth, in a regular cycle (called lunar phases), also affect how all plants grow and how all animals behave. Examples of animal behavior being affected by moonlight (or its absence) include the timing of Pacific salmon going downstream to the ocean, the timing of Christmas Island red crabs going to the ocean to dump baby crabs into the water, and the tidewater movements that bring floating food particles unto filter-feeding oysters. [For more about how the moon “rules”, see my article “The Moon Rules”, ACTS & FACTS, 44(9):21 (September 2015), posted at http://www.icr.org/article/moon-rules .]Thanks, God, for making the moon!