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eng.satellite-coverage-angle Calculator
Calculates satellite ground coverage angle, footprint radius, and elevation angle from orbit altitude and nadir angle. A satellite at 36,000 km (GEO) covers 42% of the Earth's surface from a single position — LEO satellites cover only 0.1–0.5% but have much lower latency.
Inputs
Orbital Altitude Km
Reference formula or conversion factor shown for context.
Minimum Elevation Deg
Reference formula or conversion factor shown for context.
Earth Radius Km
Distance from centre to edge of a circle. Radius = diameter / 2.
Results
coverage half-angle (°)
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.
footprint radius (km)
The computed radius -- half the diameter.
footprint area (km²)
The computed two-dimensional surface area.
% of Earth surface
Reference formula or conversion factor shown for context.
ISS 400km at 5° min-el
The value at the specified point or condition.
global coverage sats needed
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.