Image taken from: blogspot.com

The Orrey -
By Definition an orrey is a mechanically driven astrological model in which the planets revolve around a stationary sun.

This example built by Mr Murray Keir in Australia, uses SDP Gears to bring the orrey to life. Check out the blog which includes a detailed list of the parts you will need to make your own orrey.

http://brassorrery.blogspot.com/