This is a prototype of JavaSketchpad,
a World-Wide-Web component of The
Geometer's Sketchpad. Copyright ©1990-1998 by Key
Curriculum Press, Inc. All rights reserved. Portions of this work
were funded by the National Science Foundation (awards DMI 9561674
& 9623018).
Mars Retrograde Motion [Bullard, Worrall, Math.
Teacher Jan, 2000]
scroll to bottom.
Click the Animate button to Start & Stop.
Sun perspective & Earth perspective: Sun & Mars against
fixed stars. One sun rev = earth year.
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