Orbital Regression of Synchronous Satellites Due to the Combined Gravitational Effects of the Sun, the Moon, and the Oblate Earth

Orbital Regression of Synchronous Satellites Due to the Combined Gravitational Effects of the Sun, the Moon, and the Oblate Earth

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Earth satellites in synchronous equatorial orbits are called "stationary," but over long periods their orbits do in fact vary. R-399-NASA analyzed the perturbations due to the gravitational effects of the sun and moon.