Dwimmermount describes the worlds of Ioun (taking the place of Luna in relation to our Earth), Aeron and Kythirea as orbiting Telluria. Effectively, all of these worlds are moons of Telluria, but only Ioun Is close enough to be thought of as "the Moon".
One question I have, does Telluria orbit the sun, or does the sun orbit Telluria?
In the former case it seems that with Aeron and Kytheria being so far from Telluria that they're observed in the practical sense as planets instead of moons that these planets would be affected by wide variances of temperature as they are get significantly closer or farther away from the sun as they orbit Telluria. (Barring the explanation that their climates are more stable due to magic of one kind or another.) Unless their orbits were perpendicular to the orbital plane of Telluria in relation to the sun, and parallel to the sun itself. I'm not sure I'm using the correct terms here, but imagine the line between Telluria and the sun being an axle,nand the orbits of Aeron or Kytheria being a wheel around the "hub" of Telluria that allows the axle to roll 360 degrees around the central point of the sun. It's weird, but it's the only way I've been able to make sense of Aeron and Kytheria also orbiting Telluria.
In the case where the sun also orbits Telluria I haven't been able to come up with any way this would actually make any kind of sense for Aeron and Kytheria to have any stability to their climate outside of super magic.
An exhibit in Dwimmermount also displays representations of planets known as Kron and Diwo. It seems these planets are otherwise unknown to the inhabitants of Telluria. Is there anything else known about these planets? Are these planets otherwise un-observable planets in the Dwimmerount solar system? Former home planets for the Ancients? I'll understand if the answer is "nobody outside of James" knows. Just wondering if there was further available information that I had missed. It seems like the elders to the Terrims living below Dwimmermount might know.