Board Thread:Questions and Answers/@comment-34992768-20180909131747/@comment-31763506-20180918082549

I think there's enough mentions of the sun in the game text to warrant the assumption that there's just the one. For example Megail, Yarra and Nalili all refer to "the Sun" during the Aram/Eustrin content, as do some of the inhabitants of Ramasta.

The world is also called a "globe" by Simon in the Stineford library.

Likewise, Orcent's speech on arriving at Rodak (that they must have traveled far to the North or South) warrants the conclusion that the world's axial tilt is somewhere between 0 and 45 degrees, because any more towards 90 degrees would not have permanant polar regions. He says the snow could also be magical, but being naturally near a pole is the more probable assumption.

We don't know that a year in TLS is a real world year, the passage of time is spoken about with sufficient frequency in contexts that make you think it is. So much so that if it turned out that annual cycle was not ~525600 minutes at this point that it would be a genuine plot twist.

You're right, of course, that making any assumptions about nature in a world where magic exists is technically fallacious, but almost no one sets their fantasy fiction in the AD&D plane of Pandemonium, where there is no natural law per se. The setting is supposed to be familiar to the reader on some level, so things like the existence of a sun and moon and so on are taken for granted unless they're explicitly explained as being different.