Multiple forms of this process are thought to be responsible for Milankovitch cycles, and when torque is present, this process is referred to as "gyroscopic".
For one form of this process, the angular velocity may be calculated as one over the speed of light-squared times gamma-squared over gamma-plus-one times the cross product of the vectors "a" and "v". Another type of this phenomenon for an electron in an EM field may be modelled by the Bargmann-Michel-Telegdi equation. General relativity resolved a discrepancy in this process for (*) Mercury's perihelion. Multiple forms of this process are thought to be responsible for Milankovitch cycles, and when torque is present, this process is referred to as "gyroscopic". When this process is perturbed, a bobbing motion called nutation occurs. For 10 points, name this process in which the direction of a rotating object's axis changes.
For one form of this process, the angular velocity may be calculated as one over the speed of light-squared times gamma-squared over gamma-plus-one times the cross product of the vectors "a" and "v".
precession [or Thomas precession; or Larmor precession; or de Sitter precession]