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Mathematical developments of the gravitational effects of the sun and moon on a close satellite were made. The developments were made as a result of attempts to adapt to a form convenient in analyzing close satellite orbits for terrestrial gravitational field variations. The disturbing functions are expressed in osculating Keplerian elements for use in equations of motion. (Author).
Orbital motion is a vital subject which has engaged the greatest minds in mathematics and physics from Kepler to Einstein. It has gained in importance in the space age and touches every scientist in any field of space science. Still, there is almost a total dearth of books in this important field at the elementary and intermediate levels — at best a chapter in an undergraduate or graduate mechanics course.This book addresses that need, beginning with Kepler's laws of planetary motion followed by Newton's law of gravitation. Average and extremum values of dynamical variables are treated and the central force problem is formally discussed. The planetary problem in Cartesian and complex coordinates is tackled and examples of Keplerian motion in the solar system are also considered. The final part of the book is devoted to the motion of artificial Earth satellites and the modifications of their orbits by perturbing forces of various kinds.
The report presents the development of a solution for satellite orbits in a nonrotating atmosphere and takes into account the second through fourth zonal harmonics of the gravitational potential. It is basically an extension of Lane's work in that his power-law representation of the atmospheric density function, which implies a linear density scale height, is replaced by a density function with a quadratic density scale height. The quadratic scale height is shown to provide a substantially better fit to the atmospheric density. To integrate the equations of motion analytically, it is necessary to expand the density function in a series. Limitations which appear in the Lane and the Brouwer and Hori theories for small eccentricities, low inclinations, and critical inclinations still exist. (Modified author abstract).