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 |