Abstract
The gravitational quadrupole moment is considered insofar as its effect on the perihelion precession of Mercury and pericenter precession of satellites is concerned. It is found possible to separate the quadrupole precession from the precession due to the general theory of relativity. As a corollary, it is found that an exchange of angular momentum between planet and sun takes place due to the quadrupole moment. This exchange may help to explain the phenomenon of sunspots and solar flares.

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