I have finished an orrery and put it up for sale. This particular model displays all planets and the sun of our solar system and is built inside of a globe. Globe can be opened to view the orrery or closed to hide it and show map of the earth instead. It's a bit prim heavy with 42 prims, but on the other hand it does look quite good. 150 linden dollars is cheap price for such a piece of art.
SLEX: http://www.slexchange.com/modules.php?name=Marketplace&file=item&ItemID=392623
OnRez: http://shop.onrez.com/item/382107
You can also see it in-world in Iron Bird Store at: http://slurl.com/secondlife/Blorkus/246/184/111