Over The Sky

I'm curious about exactly where the Presters are, and I thought someone here might know. Are they orbiting the earth or do they have their own orbit around the sun or something?

As far as I know in the first Aerial Log (page 90) it is stated that Presters are artificial planets in the Solar System (well, at least the Anatoray-Disith one, since the first Aerial Log was released way before Fam): 太陽系に浮かぶ人工天体プレステール。

I don't know about the orbit... maybe there are some hints behind the elaborate symbolism depicted on the flag of Prester.
For instance, there is the indication of the "Mother Planet" on the right and of Prester on the left, so it seems like the Anatoray-Disith Prester has the same orbit of Earth... like a Counter-Earth. Incidentally it would make sense because in this way this Prester would be placed in a Lagrangian point of the Earth-Sun system. But this is just my speculation

Thank you!