The Winkel projection is a group of three map projections proposed in 1921 by the German cartographer Oswald Winkel (7 January 1874 – 18 July 1953).
Winkel projections use the arithmetic mean of the equirectangular projection and other projections. There are several variants: the Winkel I projection uses the sinusoidal projection,[1] Winkel II uses the Mollweide projection,[2] and Winkel Tripel (Winkel III) uses the Aitoff projection. Winkel I and II are pseudocylindrical projections, while Winkel III is an azimuthal projection. Of these three variants, the Winkel tripel projection is the most widely known.