How do seasons work on Nirn? does it have an orbit or does it just happen?

Nirn is the center of Mundas which id the center of Auribis which is the center of existence. It has nothing to orbit.

However, season do happen (at least near the Illiac bay.) It could be due to the orbit of the sun (Magnus) around Nirn in conjunction with other stars (which are equally far away.) When it is the month that Magnus is lies on the Horizon through the entire night, it would be summer (I think.)

Quite, Nirn has seasons, though it doesn't happen for the same scientific reasons as our's do. The names of the months give it away as well (Rain's Hand, First Seed, Frostfall). I guess it could be due to the orbit of the sun, though I'm not sure if magic has the same warming effect as radiation. It seems like it falls under the same category as tides, we'll have to just chock it up to Magnus and Lorkhan when they made Nirn :shrug:

I'm not sure why seasons would happen given Nirn's cosmology (My guess is that it's for the same reason that gravity and weather and other things that are the product of real life physics happen, they just do and we're supposed to just accept that.) I'd expect that, in terms of what can be observed by most people on Nirn, at least, the seasons are pretty much the same in real life, because that would be easiest for audiences to accept.

It'd be nice to see seasons change. Chorrol, Skingrad and The Imperial City would be beautiful blanketed in snow. Also if you went up north too say, Bruma, there'd be blizzards and such. Think im gonna post this in ideas

I personally subscribe to the theory that Nirn isn't in the center of the universe and what everything revolves around, that Nirn orbits Magnus with an axial tilt resulting in seasons, and the more accepted belief in a Nirnocentric universe is a result of the common mortal delusion that they're the center of everything, but that's just me.

The wizard did it.

All the Dwemeri and Imperial Orreries show a Nirniocentric universe. Considering the Sunbird Explorers and Mananauts who have BEEN outside of Nirn, and so would know how to build an Orrery right. I know that Haskil says that
I like to point out the words "Entire Minutes", implying that he can't go more than a few minutes without thinking of Mortal affairs.

Mananauts travel via gates, not spaceships, and where they do end up are places where Nirn cannot be seen. Sunbirds are similarly limited by distances (and as I recall, neither succeeded in getting to Aetherius either). And looking at the Orreries, they appear to have strange and overly complicated orbits; it looks to me like those building them had their minds made up about Nirn being in the center of the universe and built them to accomodate it. And the fact that the Serpent's movements are not fully predictable could also suggest an incorrect model. But hey, neither theory can reliably disprove the other, so let's just agree to disagree.

I wonder how you know what means the Mananauts use to travel? Also if they have never reached the Aetherius how could they bring back the celestial minerals?

Overly complex? They're all circles.

http://dwemerstudies.wiwiland.net/images/planets.gif

You're probably thinking of Venus, which look like this when you take an earth centric model:

http://en.wikipedia.org/wiki/File:Venus_pentagram.png

Nirn at the center of the universe...hmm sounds like the Ptolemaic theory.
OP:Well considering the names of the month's (i.e. Frost Fall) and the many holidays praying for and celebrating a good harvest, I'd say the seasons do literally change

I agree. It happened that way in history
Ptolemaic theory=Stated we're center
Heliocentric theory=Stated suns center
Ptolemaic came first, widely accepted, enforced by catholic church