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While all planet in the solar system rotate counter-clockwise, i.e. from west-to-east, Venus and Uranus have retrograde rotation (clockwise or east-to-west). This is attributable to the axial tilt of these planets relative to their orbital planes that is said to determine the direction of rotation.

Any tilt greater than 90-degrees results in retrograde rotation. Being part of some collision events with multiple bodies have added to both these planets’ mass and kinetic energy, giving them retrograde tilts (axial tilts of Uranus & Venus being 98-degrees and 177-degrees respectively). Thus, both rotate clockwise on their axes.

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