Earth axis points slightly more counterclockwise, looking north, each year {precession of the equinoxes}| {equinox precession} and completes circle in 22,000 to 26,000 years. Moon nutation orbital-plane changes cause precession rate to vary over an 18.6-year cycle. Orbit variations also have 41,000-year and 100,000-year cycles.
Moon orbital-plane changes cause precession rate to vary over an 18.6-year cycle {nutation, Earth orbit}|.
5-Astronomy-Solar System-Orbit
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Date Modified: 2022.0225