On Leonhard Euler's contribution to the theory of precession and nutation

Among the immense heritage of Leonhard Euler's astronomical, mechanical, and mathematical works there has been particularly strong interest in those that deal with principles describing the Earth's perturbed rotation around its axis. The outstanding meaning of the works is obvious even today, since they give a deep insight into the essence of the phenomena of precessional and nutational displacements of the fundamental coordinate planes and axes constituting astronomical frames of reference.