Ptolemy has the epicycle rotating uniformly with respect to the
equant on a path around the deferent. The equant and the earth are equidistant
on either side of the deferent center. The planet rotates around the
epicycle at the same rate the mean sun rotates around the earth. Click on
"Animate Points" to set the model in motion. Refresh the browser to clear the
traces.
Ptolemy's Model