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Measures of the Earth:
1. Ellipsoid after Friedrich Bessel 1841:
major semi axes a = 6,377,397.1550 m
minor semi axes b = 6,356,078.9630 m
sphere of equal volume: 6,370,283.1583 m
sphere of equal area: 6,370,289.5102 m
sphere of equal dist(pol): 6,366,742.5203 m
1. Ellipsoid after Hayford 1924 (International 1924):
major semi axes a = 6,378,388.0000 m
minor semi axes b = 6,356,911.9461 m
sphere of equal volume: 6,371,221.2659 m
sphere of equal area: 6,371,227.7113 m
sphere of equal dist(pol): 6,367,654.5001 m
1. Ellipsoid after Krassovsky 1940/1948:
major semi axes a = 6,378,245.0000 m
minor semi axes b = 6,356,863.0188 m
sphere of equal volume: 6,371,109.6937 m
sphere of equal area: 6,371,116.0829 m
sphere of equal dist(pol): 6,367,558.4969 m
1. Ellipsoid World Geodetic System of 1972:
major semi axes a = 6,378,135.0000 m
minor semi axes b = 6,356,750.5200 m
sphere of equal volume: 6,370,998.8588 m
sphere of equal area: 6,371,005.2495 m
sphere of equal dist(pol): 6,367,447.2486 m
1. Ellipsoid World Geodetic System of 1984:
major semi axes a = 6,378,137.0000 m
minor semi axes b = 6,356,752.3142 m
sphere of equal volume: 6,356,752.3142 m
sphere of equal area: 6,371,007.1809 m
sphere of equal dist(pol): 6,367,449.1458 m
2. Distance North pole to equator = 10000 km (First definition for the meter)
Circumference = 40000 km.
Radius = 6366.198 km
3. Circumference = 60*360 Int. Sea Miles
Radius = 3437.747 Sea Miles = 6366.707 km
(1 international sea mile = 1.852 km)
4. Circumference = 25000 Miles
Radius = 3978.874 Miles = 6403.376 km
(1 statute mile = 1760 yard = 1760*36 inch = 1609.344 meter)
5. Circumference
Radius = 4000 Miles = 6437.376 km
(1 statute mile = 1760 yard = 1760*36 inch = 1609.344 meter)