Selected Reference Ellipsoids


Ellipse Semi-Major Axis Flattening
Airy 1830 6377563.396 299.3249646
Bessel 1841 6377397.155 299.1528128
Clarke 1866 6378206.4 294.9786982
Clarke 1880 6378249.145 293.465
Everest 1830 6377276.345 300.8017
Fischer 1960 (Mercury) 6378166 298.3
Fischer 1968 6378150 298.3
G R S 1967 6378160 298.247167427
G R S 1975 6378140 298.257
G R S 1980 6378137 298.257222101
Hough 1956 6378270 297.0
International 6378388 297.0
Krassovsky 1940 6378245 298.3
South American 1969 6378160 298.25
WGS 60 6378165 298.3
WGS 66 6378145 298.25
WGS 72 6378135 298.26
WGS 84 6378137 298.257223563