Assertion: axial precession | /r/CapableOf | occur over a period of 22,000 years
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text: Precession has two components: an axial precession, in which the torque of the other planets exerted on the Earth's equatorial bulge causes the rotational axis to gyrate like a spinning top; an elliptical precession, in which the elliptical orbit of the Earth itself rotates about one focus."(source) Precession occurs over a period of 22,000 years.