Geostationary orbit meaning

In practice, geostationary orbit (GSO) describes the orbital region about 35,786 km above the equator where a satellite matches the Earth’s rotation and appears fixed in the sky, so a ground antenna can remain continuously pointed at it. The term is a technical descriptor used across contracts and regulation (for example, satellite capacity agreements, transponder leases, procurement, insurance and spectrum licensing). It is defined in the ITU Radio Regulations and used consistently in England and Wales, Scotland, Northern Ireland and Ireland; it is not usually defined in domestic primary legislation, though it appears in Ofcom and ComReg licensing materials and in ITU filing and coordination processes. Key legal relevance includes: allocation and coordination of orbital slots and frequencies; interference management and service availability; obligations on station-keeping, collision avoidance and end‑of‑life disposal within the GSO belt; regulatory authorisations (for example, under the UK Outer Space Act 1986 and the Space Industry Act 2018 and associated regulations); liability and insurance under the Outer Space Treaty and the Liability Convention; and due diligence in M&A and financing of satellite operators. Also called a geostationary‑satellite orbit, it is a subset of the geosynchronous orbit and underpins broadcasting and fixed satellite services commonly licensed by Ofcom and ComReg.