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    Planet retrograde motion, Earth-center, Sun-center

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    How can planet retrograde motion be explained by the Earth-center hypothesis? By the Sun-center hypothesis?

    © BrainMass Inc. brainmass.com September 29, 2022, 12:58 pm ad1c9bdddf
    https://brainmass.com/physics/planets/planet-retrograde-motion-earth-center-sun-center-54844

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    There is a very good explanation on the web:

    http://www.scienceu.com/observatory/articles/retro/retro.html

    In a few words, one can summarize as follows: in most cases, planets wander from west to east on the sky, but sometimes they slow down for awhile, stop, move from east to west (this is the retrograde motion), slow down ...

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