The retrograde rotation of planets and orbits can be explained as ; The westward movement of the planets on their orbits
The planets in the solar system move/drift eastwardly every 24 hours on their orbits against the backdrop of stars in the galaxy. but in some months of the year the planets are observed to be drifting westward before they return back to their eastward movement.
Therefore the westward movement of the planets on their orbit is called a retrograde rotation of the planets
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