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.
Q: In three dimensions, one type of this phenomenon can be derived from applying two Lorentz transformations whose velocities point in opposite directions. In general, that phenomenon accounts for the difference between a naive estimate and the true spin-orbit Hamiltonian. Another type is utilized by NMR. In classical mechanics, its period is defined as 4 pi-squared times an object's moment of inertia, all divided by its torque times the period about a certain axis, while planetary orbits may undergo apsidal or perihelion types. Geometric, Thomas, and gyroscopic are also different types of, FTP, what phenomenon, the change in direction of an object's axis of gyration
A:
Science