The spherical helix is the tangent indicatrix of a curve of constant this. A relativistic form of it occurs for bound electrons due to their being in non-inertial frames and is named for Thomas. Vector quantities generally undergo this phenomenon when orthogonal to their time derivatives. A second-order type of this motion is called nutation. Analysis of the best-known type of it requires the understanding that the torque due to gravity is the time derivative of the angular velocity. FTP, name this physical phenomenon, 
The spherical helix is the tangent indicatrix of a curve of constant this. A relativistic form of it occurs for bound electrons due to their being in non-inertial frames and is named for Thomas. Vector quantities generally undergo this phenomenon when orthogonal to their time derivatives. A second-order type of this motion is called nutation. Analysis of the best-known type of it requires the understanding that the torque due to gravity is the time derivative of the angular velocity. FTP, name this physical phenomenon, a periodic change axial direction of a rotating object, exhibited by gyroscopes and spinning tops.
The spherical helix is the tangent indicatrix of a curve of constant this.
precession