planetary precession

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The perturbation of the Earth's orbital plane by the attractions of the planets on the Earth's centre of mass. It causes the equinox to move eastwards along the celestial equator (i.e. in the opposite direction to lunisolar precession) at a rate of about 0″.12 per year. Its effect is much smaller than that of lunisolar precession.

Subjects: Astronomy and Astrophysics.

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