Assertion: anomalistic precession | /r/HasProperty | last section
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text: The two are not parallel because the two precessions discussed in the article have different periods, the precession of Earth's rotational axis in inertial space and the precession of the major axis of Earth's orbit, also known as anomalistic precession (the last section in the article), which is the advance of the line of apsides (perihelion and aphelion).