Paper Plate Education
"Serving the Universe on a Paper Plate"

Activity: Ptolemaic Polemic

Plate courtesy of Gene Zajac.

Make Ptolemaic model with equants, epicycles, and deferents to explain retrograde motion. 

Contributed by Chuck Bueter.

GLPA Proceedings, 1999, p. 37.

See also the Geocentric vs. Heliocentric activity.

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