Retrograde Motion

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Retrograde Motion

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1. Motion in an orbit opposite to the usual orbital direction of celestial bodies within a given system. Specifically, of a satellite, motion in a direction opposite to the direction of rotation of the primary. </dd>
2. The apparent motion of a planet westward among the stars. Also called retrogression. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use