So I was hunting at night and decided to look up at the sky, and I saw the largest ''moon'' in the sky, I noticed for the first time that the surface was moving, then I noticed that it was an atmosphere and there was what appeared to be land formation. Is this moon a planet?

Also, I noticed that there is a cluster of 3 bright stars west of the ''moon''. Nice visual.

That's just the way the moons look in the Elder Scrolls. The setting of the Elder Scrolls is not Earth and has its own moons that are quite different from our own moon. There's some lore on the moons but the lore forum would be a more fitting place to go into detail on that. As to what you see in the game, as you can see, there are two distinct moons that follow their own cycle in the sky, much as the moon does in real life, you can also see that they take up a lot more of the visible sky than our own moon tends to.

I've never noticed the surface of the moons moving, though.

Well my guess about Masser is that is sort of looks like what Nibiru is believed to look like

On note: A little outside lore is needed here

I do not believe the surface of the moons move. But when there are wisps of cloud in front of the moons, it can look like it. The clouds are what is moving though.

You mean the big red planet of doom that is ''coming to kill us all''

The planet/moon will mess up our magnetic field and such, causing catastrophic events which will make money and government meen nothing.
Dying becomes easy and living becomes hard.

That Nibiru? :hubbahubba:

It was a cloudless night? Does that matter>?

The Moons, Masser and Secunda, are the corpse of Lorkhan.

I've never seen any type of movement on the moons, and I've looked at them a lot.

This.