Inferior Ptolemaic Model Ptolemy's orbit for a inferior planet simulation to help you with your studies.
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Inferior Ptolemaic Model Ranking & Summary

Inferior Ptolemaic Model Tags

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Inferior Ptolemaic Model Description

Inferior Ptolemaic Model is a simple, easy to use, Java based application specially designed to illustrate Ptolemy's orbit for a inferior 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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