**Effect of terrestrial oblateness on artificial satellite**
http://farside.ph.utexas.edu/teaching/celestial/Celestialhtml/node93.html

We conclude that the Earth's oblateness causes the mean angular velocity of an orbiting satellite (which, by definition, is equal to ) to slightly exceed the Keplerian value for low inclination orbits that satisfy , to be slightly less than the Keplerian value for high inclination orbits such that , and to exactly equal the Keplerian value when .

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