I was playing the game and Ranni's celestial bullshit spawned, which is cool and all but I noticed something, that something being the moon was actually
in front of the Erdtree's branches, obviously a quad digit km moon wouldn't be so close to earth to be beneath a giant tree if legit, now this means two things.
1. It was just a graphical error and the moon in the sky (which is evidently an actual 3D model), was simply placed lower in the skybox and clipped beneath the Erdtree and into its branches a bit.
2. The moon is actually quite small and actually within the atmosphere, and while it is quite large (About half that of the Erdtree, so a large slew of kilometers), it definitely ain't no moon and may as well just be considered a mountain, and while the moon/tree is huge (a few km, probably a few hundred km if we go the Zelda route as The Land's Between is stated to be a continent, would make the Caelid and Falling Beast Feat well within tier 6 if we go that route fyi) if this is indeed the case it could spell disaster for some of the high end feats (The tier 4 shit).
I do not know which is the case, I will look into it, it could have very much been a game thing and was just where I was looking at it that caused some game fuckery to have the actual moon 3D model to appear to clip, or it could be that the moon is actually not like ours, further testing will be needed, if I can't replicate it consistently, it's almost certainly just an oversight.
That or it's l o r e stuff and is completely unrelated to actual moons, might be, idk, I don't know the lore, watch it be like a hologram illusion.