The study of the dynamics of satellites has a unique fascination for
student and lecturer alike. It is not only a logical subject explainable
by the few basic principles of mechanics, but has contributed so
extensibly to the formulation of mechanics in the first place, and is
still continuing to do so. With the launching of Sputnik I on October 4,
1957, engineers have entered the field for good, and the study of the
dynamics of spacecraft is taking its rightful place as a subject within
engineering mechanics. The primary purpose of the present text is to
acquaint engineering students with the fundamentals of spacecraft orbit
dynamics. The text is intended for senior undergraduate or for graduate
students, as well as for engineers in the various branches of the
aerospace industry. Students using the text are expected to know the
rudiments of astronomy and to have an adequate com- mand of elementary
dynamics, of differential and integral calculus, and of vector and
matrix algebra. Vec- tors and tensors appear in matrix form, since the
matrix formulation is not only well suited for computer programming, but
also because it affords a quick and intelligible assessment of the
problem situation, so essential for engineering practice.