Geostationary orbit

A geostationary orbit (GEO) is a circular orbital path around Earth where a satellite moves at exactly the same rotational speed as the planet below, remaining fixed over a single point on the Equator.

At roughly 35,786 kilometers altitude, this sweet spot balances gravitational pull with the satellite's orbital velocity, creating a 24-hour orbital period that matches Earth's rotation. The concept was proposed by science fiction writer Arthur C. Clarke in 1945 and achieved in practice with Synchronous Communications Satellite (SYNCOM) in 1964.

Today, GEO is crowded with telecommunications satellites, weather monitoring systems, and broadcasting stations. Because they appear stationary to observers on Earth, they're ideal for transmitting television, radio, and Internet signals to fixed ground stations—no tracking equipment needed.

However, geostationary slots are scarce real estate. Only one satellite per longitude position can occupy the orbit safely, creating International coordination challenges. The orbit is also susceptible to Solar wind and Radiation, requiring periodic orbital adjustments and fuel reserves.

Modern alternatives like low Earth orbits and satellite constellations now compete with GEO for coverage and latency-sensitive applications.

Related

Synchronous orbit, Orbital mechanics, Satellite communication, Clarke Belt, Space debris