F.N. Krassovskiy Central Research Institute of Geodesy, Aerial Survey and Cartography (CNIIGAIK)
It is accepted as a rule, that the Moon’s and Sun’s attractive forces are applied to the Earth’s mass center. But the forces are displaced from this point because of the Earth’s flattening. This fact was known to Newton, Euler, Poincare and others. The contemporary accuracy of astronomical observations obliges to perfect its theory of calculations.