Image: Apparent retrograde motion of Mars in 2003

Description: This image was created as part of the Philip Greenspun illustration project.
Title: Apparent retrograde motion of Mars in 2003
Credit: Own work
Author: Eugene Alvin Villar (seav)
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Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes