A method is given for finding the equation of the equipotential surface of the planet from the parameters of its external gravitational field. Formulas for calculating the parameters of a triaxial ellipsoid approximating its first approximation figure are obtained, and in particular, their numerical values for a lunar ellipsoid are found.According to the Stokes constant of the Moon up to the 13th order inclusive, two versions of selenium maps were constructed and discussed.
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