PURPOSE: To illustrate the epicycle nature of Ptolemy's model of the solar system.
DESCRIPTION: This device consists of a rotating wooden disc on a stick. Steadily rotate the stick around its end while simultaneously rotating the smaller disc. The dot in the light area on the disc represents a planet.
SUGGESTIONS:
REFERENCES: (PIRA 8A10.60)
EQUIPMENT: Model as photographed.
SETUP TIME: None.
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