One of the most puzzeling things for ancient astronomers was how to understand the movement of the planets. These websites explain the mysteries behind retrograde motion and its development through history.
Ineractive applet: http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::800::600::/sites/dl/free/0072482621/78780/Retro_Nav.swf::Retrograde Motion
History and Exlpanation: http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html
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