Does anypony have an explanation for the way time works in Equestria? There is the annual ceremony known as the "Summer Sun Celebration", where Celestia raises the sun, so with this in mind, we can conclude that if the have seasons, they must have years as well. In the first Equestria Girls movie, Sunset Shimmer said that the portal opened every 30 "moons". Knowing that they have regular daytime and nighttime cycles, should we assume that one of these "moons" that Sunset was referring to is the equivalent to one year? It seems plausible at first, but that would make Sunset at least 30 years old, or 30 moons, so she wouldn't be in Canterlot High. However, we do see Fleur Dis Lee attending CHS, so maybe her human counterpart is also a lot younger than her pony self, but the Mane 6's counterparts are all respectively the same age. Maybe Fleur Dis Lee is just in an odd relationship with Fancy Pants.
Perhaps I am viewing this wrong, and one "moon" just symbolizes one full lunar cycle, but if that was the case, Sunset wouldn't have needed to wait so long to steal Twilight's crown, unless of course, she was just waiting for the right time to strike. Here on Earth, the moon is always the moon, no matter what angle it reflects light from, but maybe in Equestria, only a full moon is considered a moon.
There are other examples of moons being mentioned as a unit of time, and maybe a moon is a year, and they just have really short seasons. I'm obviously having trouble putting the pieces of this puzzle together, and any theories and/or suggestions would be dearly appreciated. All thoughts and opinions are welcome and are to be respected, so please don't hold back any thoughts that you feel may be valid. You sharing your ideas is the only way we will figure out this broad question! Thank you everypony for your help!