*uses his epic necromantic lich powers to bring back this thread*
I only skimmed the thread, mainly paying attention to the posts with pictures and rather short posts, for now.
A thought that came to me a while back when I first found this thread, but forgot to post it, and which came back to me recently, is a simple thought and one that I do not see as being thought up in this thread:
What if Tyria has more than one moon? Currently, we have no statement (to my knowledge) on the moon itself, and it is true that we only see one moon at a time - but that doesn't mean there cannot be two or more moons that rotate around the planet, just that we haven't seen two or more moons in the same area at the same time.
And would provide an answer to the various orbit paths that we see.