epicycle model with equant animation

    Caption: An animation illustrating the Ptolemaic system's epicycle model (with equant located by the green dot) for Jupiter ♃ en Espanyol.

    Features:

    1. The Ptolemaic system was presented by Ptolemy (c.100--c.170 CE) in his book the Almagest (c.150 CE) supplemented by his other book Planetary Hypotheses (c.150).

    2. The animation shows 3 oppositions of Jupiter with their accompanying apparent retrograde motions.

    3. For a fullish explication of the epicycle models (with equants), see ptolemy_epicycle_equant.html.

    Credit/Permission: User:Fernando de Gorocica, 2017 / CC BY-SA 4.0.
    Image link: Wikimedia Commons: File:Almagesto. Sistema Geocéntrico o Ptolemaico.gif.
    Local file: local link: ptolemy_epicycle_equant_animation.html.
    File: Ptolemy file: ptolemy_epicycle_equant_animation.html.