I don't know if this is my card -- a crappy GMA X3100 -- rendering a texture improperly or the planet's shadow is pointing the wrong way:

http://img296.imageshack.us/img296/1466/dump0002ye1.png

This is the Itani capital.

Does the 'shadow' follow the planet while it slowly spins?

It doesn't seem to spin. These were taken twelve minutes apart:

http://img117.imageshack.us/img117/2564/dump0015na5.png
http://img224.imageshack.us/img224/879/dump0017bc9.png

Huh. Interesting.

By the way, for future reference: this is on a previous gen Macbook; latest OSX 10.5.5.