The formation flight is the use of several small satellites, which work together in a group to accomplish the objective of one larger, usually more expensive, satellite. This actually increases the likelihood of mission success when malfunctions occur. This book presents the equations of motion and conditions of keeping the satellites in the formation invariable relatively. Working with the Hamiltonian model of the relative motion including the perturbation effects of the asphericity of the Earth. Supported by, King Abdul-Aziz University Jeddah, Kingdom of Saudi Arabia.