This is the story of how an entire fandom has overlooked one of the most popular character's true royal duty.
*EDIT* True duty as in why she raises the moon she is and forever will be the Princess of the Night
*Further EDIT* I am aware that there is nothing in canon to even suggest this other than physics not completely being ignored in Equestria and as such is a direction I hope the fanon will agree is a good one. This was written with the hopes of inspiring a new take on Luna stories.