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Retrograde Planets

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The term retrograde is from the Latin word retrogradus – "backward-step", the affix retro- meaning "backwards" and gradus meaning "step". Its literal meaning is to go back to its original state, which is normally complex and less pleasant. Retrograde is most commonly an adjective used to describe the path of a planet as it travels through the sky, with respect to the zodiac, stars, and other bodies of the celestial canopy.

The celestial bodies of solar system can be studied in four groups. F...