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v1.1.1
Free engineering tool

GEO Satellite Look Angle Calculator

Enter a ground-site latitude and longitude plus a geostationary orbital longitude to estimate true-north azimuth, idealized elevation, longitude separation, and horizon visibility.

Calculations run locally in your browser. Share links include coordinates after #; anyone with the link can read them.

Planning Tool: GEO Look Angles

deg
deg
deg

AZIMUTH

126.1°

ELEVATION

46.0°

Longitude separation

29.8°

Earth-centre angle

38.0°

Idealized visibility

Above idealized horizon

Idealized geometric estimate for a geostationary position on a spherical Earth. It is not live coverage, polarization/skew, an obstruction check, or pointing authorization. Verify the spacecraft position, datum, operator instructions, and site survey.

Sharing puts three coordinates in the URL fragment (after #). Anyone with the link can read or forward them. Calculations and CSV generation run in this browser.

Transparent geometry

The calculation uses a spherical Earth and a circular geostationary orbit. Azimuth is measured clockwise from true north; elevation is measured above the idealized local horizon.

Earth radius
6,378.137 km
GEO orbital radius
42,164 km

Reading the result

Use the results as a reproducible planning estimate, then verify them against current spacecraft and site information.

  • Azimuth gives the horizontal direction clockwise from true north.
  • Elevation gives the idealized vertical angle above the local horizon.
  • A non-positive elevation marks a geometrically unavailable GEO position in this model.

Planning boundary

This is a geometry tool, not a coverage, link-budget, or pointing-authorization system.

  • No ellipsoid, terrain height, atmospheric refraction, or orbital drift correction.
  • No obstruction, antenna mechanics, polarization skew, weather, or interference assessment.
  • Confirm ephemeris, beam coverage, licensing, operator instructions, and a site survey before deployment.