Satellite Retro-grade and Pro-grade motions

Retrograde motion is motion in the direction opposite to the movement of something else, This motion can be the orbit of one body about another body or about some other point, or the rotation of a single body about its axis, or other phenomena such as precession or nutation of the axis.

Orbital motion in the usual direction of celestial bodies within a given system; specifically, of a satellite, motion in the direction of rotation of the primary. More specifically, it is opposite to retrograde.

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