Valence, that is hysterical. I am a retired theoretical astrophysicist and it was the first thing I worried about when the mobile moon first cropped up. (And don't get me started on Dalamud.)
But given the game breaks every other planetary reality, such as day-night cycles dependent on latitude/longitude, seasons, and the shadow and atmospheric incompatibilities on the moon, I decided the answer probably had something to do with aether.