Publisher Summary This chapter discusses the attitude control and navigation. Control of the attitude of a satellite is important to increase its usefulness and effectiveness for establishing reliable communications links. If a satellite is stabilized in orbit, its directional antennas can be proper1 y pointed toward earth, solar arrays can be properly pointed perpendicular to the sun's light, satellite sensors can be painted properly in the celestial space, and transfer orbits can be executed for tracking purposes and to properly align the satellite centerline for futures firing of motors. Finally, a satellite is exposed to a series of adverse torques generated by atmospheric drag, solar wind, magnetic fields, solar and space radiation gravitational fields from multiple celestial bodies, and micrometeorite impacts. Proper attitude control of the spacecraft addresses such adverse torques.