What is retrograde planetary perihelion precession?

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Retrograde planetary perihelion precession refers to the phenomenon where the perihelion, or the closest point of an orbiting body to the Sun, shifts direction during its orbit. Typically, perihelion precession occurs in a prograde motion, aligning with the orbit's direction. However, in retrograde perihelion precession, the perihelion moves opposite to the orbit's direction. This concept highlights the complexities of orbital mechanics and gravitational influences. Understanding these motions is essential for comprehending planetary dynamics.
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.
 
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hi magheera! :smile:

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
 
fantastic! Thanks so much.
 

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