She's a diety. I would imagine moving them wouldn't be extremely hard for her, so she probably has time to teach basics of magic here and there while keeping cycles normal. This is just a guess though.
Haha it was a joke. :P Raising the sun/moon takes all of a few seconds I'm sure, and it's not like there is any war or violence in the perfect world of equestria either. I mean, what else does she have to do, really?
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