- Geographic coordinate system
- Geodesy
- World Geodetic System
- EGM96
- Geodetic system
- Longitude
- Latitude
- Datum (geodesy)
- Orthometric height
- Normal height
- Geopotential height
- Sea level
- Above mean sea level
- Above ground level
- Flight level
- Geoid
- Universal Transverse Mercator coordinate system
- Military grid reference system
- Coordinated Universal Time
- Global Positioning System
- Earth
- Earth's rotation
- Standard gravitational parameter
- ECEF
- North East Down
- Reference ellipsoid
- Ellipse
- Semi-minor axis
- Semi-major axis
- Eccentricity (mathematics)