Geostationary satellite meaning

In communications and space regulatory practice, a geostationary satellite is a satellite that appears fixed above a single point on the Earth’s equator because it follows a circular, prograde orbit in the equatorial plane with a period of 24 hours. In effect, it remains stationary relative to the Earth. This is a descriptive technical term rather than a statutory definition in the UK or Ireland, but it aligns with usage in the ITU Radio Regulations and is widely used in spectrum licensing, orbital filings and contracts (including fixed‑satellite service (FSS) and broadcasting‑satellite service (BSS)). Key legal features and significance include: - Occupation of a defined “orbital slot” and associated frequency assignments. - International coordination and notification via the ITU; national authorisations for space objects and earth stations. - Interference management and priority rights in spectrum/slot coordination. - Commercial arrangements such as transponder capacity leases and service level obligations. - Liability and insurance requirements, including under UK space legislation (Outer Space Act 1986 and Space Industry Act 2018), and standard market insurance. Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland. Ofcom (UK) and ComReg (Ireland) manage spectrum licensing; ITU filings are made through the relevant national administration.