Superior Ptolemaic Model Illustrate Ptolemy's orbit with this simulation.
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Superior Ptolemaic Model Ranking & Summary

Superior Ptolemaic Model Tags

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Superior Ptolemaic Model Description

Superior Ptolemaic Model is a handy, small, Java based tool specially designed to illustrate Ptolemy's orbit for a superior planet. The model consists of a deferent circle, centered on a point some distance from Earth (at the eccentric point). Attached to this deferent is the center of another circle, the epicycle. The center of the epicycle moves around the deferent with constant angular speed as seen from the equant point, which is exactly opposite the center of the deferent from Earth (so the center of the epicycle does not move at constant speed along the deferent). The planet moves along the epicycle at constant speed. This model is capable of reproducing retrograde motion and variations in the planet's brightness. It can also reproduce variations in the apparent size and spacing of the retrograde arcs. In this simulation the planet is assumed to move in the plane of the ecliptic, so its latitude is always zero.

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