satellite communication

Orbital Mechanics

Orbital mechanics is primarily concerned with motions under gravity, either as a single force or in conjunction with other forces such as thrust, drag, lift, light pressure, and others. It has a long history as a topic, with the motions of the planets, Moon, and Sun studied since ancient times and a scientific foundation beginning around 500 years ago. With the advent of human-built spacecraft, the focus has shifted from simply observing the motions of natural bodies to planning and carrying out missions