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In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

William de Sitter described a general relativistic correction to it in 1916. The Thomas variety of this process is a correction to the spin-orbit interaction in an atom, and Larmor described this process happening to magnetic moments in the presence of an external field. The Lense-Thirring effect causes this to occur near massive objects, and Poinsots Ellipsoid is an example of the torque-free variety. The Earth undergoes this process with a period of 26000 years, and tidal forces in the form of nutation perturb it. For ten points, identify this general physical process in which the angular momentum vector of an object rotates.
Output:
Science