Example image of eyePlorer eyePlorer map for 'Geographic coordinate system': Coordinate system Latitude Longitude Spherical coordinate system Ellipsoid Sphere Tuple Equator Circle of latitude Fundamental plane (spherical coordinates) North Pole South Pole Lambda Meridian (geography) Prime Meridian Royal Observatory, Greenwich United Kingdom Antipodes International Meridian Conference Brazil Dominican Republic France Altitude Depth Baltimore United States Ellipse Semi-major axis Semi-minor axis Perspective (graphical) Spherical trigonometry Decimal degrees Datum (geodesy) Sea level Newlyn Cartesian coordinate system Earth ellipsoid British national grid reference system World Geodetic System ED50 NATO Gravitational field Potential energy Moon Tide Weather Ice age Scandinavia Scotland Metre