magheera
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I know what each word mean independently, I'm just confused as to what sort of motion is trying to be described as a whole.
What is retrograde planetary perihelion precession?
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hi magheera! 
perihelion precession means that the perihelion moves slightly each orbit
usually, this is prograde, which means in the same direction as the orbit itself
retrograde means the perihelion moves in the opposite direction to the orbit
perihelion precession means that the perihelion moves slightly each orbit
usually, this is prograde, which means in the same direction as the orbit itself
retrograde means the perihelion moves in the opposite direction to the orbit
magheera
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fantastic! Thanks so much.