retrogradation
ret·ro·gra·da·tion / ˌretrōgrāˈdāshən/ • n. Astron. & Astrol. the apparent temporary reverse motion of a planet (from east to west), resulting from the relative orbital progress of the earth and the planet. ∎ the orbiting or rotation of a planet or planetary satellite in a reverse direction from that normal in the solar system.
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retrogradation
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