двовісний і тривісний еліпсоїд

Purpose. The purpose of this work is to show how redistribution of masses occurs as a result of gravity-rotational and endogenous forces in the evolutionary self-development of the planet, which leads to the transformation of the lithosphere from the sphere to the biaxial and then to triaxial ellipsoid, and vice versa; and changes in compression and the movement of the pole in geological time. Determine the deformation of the figure of the lithosphere due to the reorientation of the figure's pole. Methodology.

Purpose. Planetary problems play in geosciences very important role. The aim of this work is to improve methods and algorithms for approximating of the physical surface of the planet by biaxial and triaxial ellipsoid for study the dynamics of change of its shape. Methods. Classical approaches to the determination of Earths shape provide computation of evolution ellipsoid parameters of that in the best way fits to geoid, or quasigeoid. Such approach allows to provide initial reference surface for many coordinates systems.