The SK-42 reference system also known as the Krasovsky 1940 ellipsoid, is a coordinate system established in the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...

in 1942 as ''Systema koordinat'' (russian: Система координат 1942 года), and provides parameters which are linked to the geocentric Cartesian coordinate system PZ-90. It was used in geodetic calculations, notably in military mapping and determining state borders. The coordinate system SK-42 served as a foundation for developing the SK-63 reference system which was created and used primarily for civilian and industrial development purposes. The Krasovsky 1940 ellipsoid uses a semi-major axis (equatorial radius) of 6,378,245 m, and an inverse flattening of 298.3

Citations and notes

Geodesy Navigation Surveying Geographic coordinate systems Geography of the Soviet Union Science and technology in the Soviet Union {{geodesy-stub