Pod Ages
Yes! We finally have confirmation on our theory.
A few weeks ago, Nadnerb and I were contemplating the similarity in day lengths between Negilahn and Dereno: their days are exactly the same length. The only thing that I could think of that would explain this would be if we were using Linking Books to link to different pods on the same planet.
Well, according to this map that Cate Alexander left in the city, that theory was right! :)
The Cavern Today has a copy of the; map loaded on their forum: link