McB, I can't offer you much as far as answering your question is concerned, but I do have to thank you for inspiring me to create an astronomer character
The only real examples of astronomy in TES is the dwemer, so I guess we don't really know much. This is what uesp had:
Nirn has two moons, Masser and Secunda. The other astral bodies in the sky above Nirn are believed to actually be the spheres of the Aedra and Daedra, as seen from the mortal plane. The sun and stars are also punctures in the veil of Oblivion, through which the light of Aetherius shines into Mundus. One exception is the snake constellation, The Serpent, which 'wanders' about the sky. It is made up of "unstars".
This post has been edited by Vital: Sep 14 2014, 09:32 AM
I'll probably disappear for a minimum of 10 minutes after this post..