This Book is the outcome of the practical necessity in the launching of space laboratories in the equitorial orbit .It deals with the study of the combined effects of the Solar radiation pressure and Earth's magnetic field on the motion and stability of two satellites connected by a light, flexible and non-conducting inextensible cable in the central gravitational field of the Earth, in which the interference of the Earth's shadow has been taken into consideration.

The Book entitled "Infinitesimal Under Radiating Primaries" and subtitled "Effects of Radiation of Primaries on Stability of Equilibrium Points in the Elliptical Restricted Three Body Problem" deals with the motion and stability of the infinitesimal mass in the vicinity of the Lagrangian equilibrium points in the elliptic restricted three body problem.The model is studied by considering both the primaries as radiating, assuming that the eccentricities of the orbit of the primaries are small.