http://demonstrations.wolfram.com/RetrogradeMotion/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
Earth's smaller orbit and faster orbital speed allows it to pass Mars. Through most of the year, Mars appears to move in one direction against the background stars when viewed from Earth. However, when Earth passes Mars, it appears as if Mars reverses d...
Contributed by: Jeff Bryant
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