Publisher's description - Inferior Ptolemaic Model
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Inferior Ptolemaic Model is a free and easy to use software that illustrates Ptolemy`s orbit for a inferior planet.
Inferior Ptolemaic 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.
Inferior Ptolemaic Model can also reproduce variations in the apparent size and spacing of the retrograde arcs.
NOTE: Inferior Ptolemaic Model is licensed and distributed under the terms of the Creative Commons Attribution 3.0. License.
