Elipsoide Fecha a (semieje mayor) b (semieje menor)

1 Airy 1830 1830 6377563.396000 6356256.9100002 Airy Modific 1965 6377340.189000 6356034.4479003 Bessel 1841 1841 6377397.155000 6356078.9628404 Clarke 1866 1866 6378206.400000 6356583.8000005 Clarke 1880 1880 6378249.145000 6356514.8695506 Fischer 1960 1960 6378166.000000 6356784.2800007 Fischer 1968 1968 6378150.000000 6356768.3300008 GRS80 1980 6378137.000000 6356752.3141409 Hayford 1909 1909 6378388.000000 6356911.946130

10 Helmert 1906 1906 6378200.000000 6356818.17000011 Hough 1960 1960 6378270.000000 6356794.34347912 Internacional 1909 6378388.000000 6356911.94613013 Internacional 1924 6378388.000000 6356911.94613014 Krasovsky 19 1940 6378245.000000 6356863.01880015 Mercury 196 1960 6378166.000000 6356784.28366616 Mercury Modi 1968 6378150.000000 6356768.33730317 Nuevo Intern 1967 6378157.500000 6356772.20000018 Sudamerican 1969 6378160.000000 6356774.72000019 Walbeck 181 1817 6376896.000000 6355834.84670020 WGS66 1966 6378145.000000 6356759.76935621 WGS72 1972 6378135.000000 6356750.51991522 WGS84 1984 6378137.000000 6356752.314245