Quote Originally Posted by Sav View Post
That's no moon...
...that's a space station.

But on a more serious note, the recent change in colour screams out this will be some form of plot point.

It has also been stated that the resident's of Hydaelyn do not carry the concept of there being other worlds, planets etc. Such concepts are beyond them and they are simply in touch with what they have exposed to them. When they look at the night sky, they see the two moons as the icons of Menphina and Dalamud, her loyal hound.

The truth may be a completely different ball-game.