Prograde vs. Retrograde Definition and Illustration

Word of the Week: Prograde vs. Retrograde

The direction an object spins in relation to its orbit around the Sun. Prograde refers to an object that spins in the same direction as its orbit. Retrograde refers to an object that spins in the opposite direction of its orbit.

Earth has a prograde rotation, and asteroid Bennu has a retrograde rotation, which means the two bodies rotate in opposite directions.

Credit: University of Arizona


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