Little Sister

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The Little Sister or lesser Moon is actually a chunk of the world disk that was ejected in an explosion millenia ago and became embedded in the innermost of the Heavenly Spheres (see Cosmology). It does not rise or set like the sun and greater moon, which are part of a different sphere. Instead, it stays in one place in the sky, moving with the world-disk's rotation.

If it could be reached, e.g. by airship, it would be difficult to colonize due to gravity pulling back towards the disk -- perhaps it could be tunneled into?

Its size is unknown. It is roughly halfway between the horizon and the zenith, which means it's as far away from the surface as maybe half the radius of the disk -- pretty far. To be visible at that distance, it must be very large -- maybe roughly the size of California?