The periodic circular motion of the axis of a rotating body due to an external torque.
Free Precession, Gyroscopic Precession, Nutation, Obliquity-Induced Precession, Planetary Precession, Precessional Constant, Precession of the Equinoxes, Relativistic Two-Body Problem
References
Duffett-Smith, P. "Precession." §34 in Practical Astronomy with Your Calculator, 3rd ed. Cambridge, England: Cambridge University Press, pp. 56-59, 1992.
