Actually, I came up with a different idea. What if, in the heliocentric model format, Celestia moved the planet around the sun and Luna the moon around the planet? It's still Celestia/Luna "raising" the sun/moon (respectively), just with a different set of mechanics than the geocentric model.And, uh, where did Applejack get her scientific expertise? Was she sneaking Twilight's books out of her library so she could read them (and use them to make her own scientific papers) before bed every night?