the moon: the light that rules the night sky
This is the ordinary Hebrew word for the moon, the bright body that lights the night. In the Bible the moon is never a god. It is one of the lamps God hung in the sky, set there to mark off seasons and to govern the darkness, and it does exactly what it was made to do.
Because it keeps such faithful, unbroken time, the moon becomes a natural picture of things that last: a promise or a throne is said to endure "as long as the moon." And because everyone watched it, its failure is dreaded. When the prophets picture God stepping in to judge, one of their favorite images is the moon going dark or turning the color of blood, the dependable light suddenly gone.
The same faithful lamp was also the great temptation. The nations around Israel worshiped the moon, and Israelites were repeatedly warned not to bow to it. So the one word quietly carries both a warning and a comfort: the thing your neighbors called a god is only a light, and the God who made it keeps it burning on schedule.