Winkel Tripel 

Release 9.2
Last modified August 3, 2007 
Print all topics in : "Supported map projections" 
A compromise projection used for world maps that averages the coordinates from the Equirectangular (Equidistant Cylindrical) and Aitoff projections. Developed by Oswald Winkel in 1921.
Learn about the Equirectangular (Equidistant Cylindrical) projection
Learn about the Aitoff projection
Modified azimuthal—coordinates are the average of the Aitoff and Equirectangular projections. Meridians are equally spaced and concave toward the central meridian. The central meridian is a straight line. Parallels are equally spaced curves, concave toward the poles. The poles are approximately 0.4 times the length of the equator. The length of the poles depends on the standard parallel chosen.
Learn about the Aitoff projection
Learn about the Equirectangular projection
The equator and the central meridian.
Neither conformal nor equal area. Useful only for world maps.
Developed for use in general and thematic world maps.
Used by the National Geographic Society since 1998 for general and thematic world maps.