It’s commonly understood that when the moon sets and rises again the next day, that’s not a “new moon” that is the same moon coming around in the sky again. But the moon does a cycle of waxing and waning again every month (well, 28 days), and then you get a “new moon”.
So “one moon” = one cycle of moon phases = roughly 1 month. This is where months came from.
It’s commonly understood that when the moon sets and rises again the next day, that’s not a “new moon” that is the same moon coming around in the sky again. But the moon does a cycle of waxing and waning again every month (well, 28 days), and then you get a “new moon”.
So “one moon” = one cycle of moon phases = roughly 1 month. This is where months came from.