On precession of Lagrange’s top

The article describes the results obtained for the upper and lower bounds (estimates) for the apsidal angle (precession angle) in the theory of the motion of the heavy symmetrical solid body about fixed point (Lagrange’s case) for arbitrary initial conditions and parameters of the body. All regions of initial conditions is divided into two sets. In the first set there is a direct precession of the top, in the second set there is a retrograde precession of the top.