Nice applets - play with these.

http://astro.unl.edu/naap/ssm/animations/ptolemaic.swf

http://www.phy.syr.edu/courses/java/demos/kennett/Epicycle/Epicycle.html
(play around with the parameters)

http://www.jgiesen.de/geocentric/index.html

http://www.jimloy.com/cindy/ptolemy.htm


http://galileoandeinstein.physics.virginia.edu/more_stuff/flashlets/EpicycleInner1.swf

http://galileoandeinstein.physics.virginia.edu/more_stuff/flashlets/EpicycleOuter.swf