  The tensor polarization of particles and nuclei is constant in a coordinate
system rotating with the same angular velocity as the spin. In the laboratory
frame, it rotates with this angular velocity. The general equation defining the
evolution of the tensor polarization is derived. An explicit form of the
dynamics of this polarization is given in the case when the angular velocity of
the spin precession is constant and vertical. It is shown that the spin tensor
interactions result in mutual transformations of the vector and tensor
polarizations. These interactions can influence the spin motion.
