i believe that is a myth.
http://en.wikipedia.org/wiki/Moon_illusion
I don't really think that's a what the wiki article says. It says tons of people have researched it, it is observable, but that nobody can agree as to the WHY of it.
Regardless of the physics of it, it looks bigger. That end result is observable. I've seen moons low in the evening just rising that were 2x larger than when they're high in the sky. I personally think a large part of it is the cooler air. Cool air makes things look closer. I've also seen it low (low-ish) when it's clearly up but still low enough to hang behind a building and it looks "normal" (or "small" compared to the examples people bring up of it being larger than normal), so it isn't perception only.
I have a view of the front range mountains here (foothills of the Rocky Mountains) and there's this one area where Excel Energy set up 3 giant windmills to study wind farming technology. They are way way out at the base of the mountains, but you can still see them. On a cool morning you can quite clearly see them towering over the tiny valley they reside in. On a hot day (driving home later in the day) they are very small and harder to see. The cooler days they look about twice as big, and the hotter days they look very small.
We know cold air already bends sound waves. It's not much of a stretch it can also affect light waves. Even if the moon doesn't change, for whatever other reasons it looks a lot larger in certain atmospheric conditions. I wouldn't say no to replicating that effect in AH.
(Although it doesn't really add anything to the game, so I wouldn't make a fuss about it either way)
