Yes, Nirn is the planet. Therefore, the equivalent of the Flat Earth Society would be the Flat Nirn Society.
And Skyrim belongs to us!
Yes, but is it the same Skyrim that we know and love from
Skyrim? Apparently they've taken a hatchet to the Cyrodil that was depicted in
Oblivion. What if they've done the same with Skyrim and Morrowind?