The Eckert I projection is a pseudocylindrical projection that is neither conformal nor equal area. This projection was presented by Max Eckert in 1906, and is generally used for novelty maps of the world showing a straight-line graticule.
Meridians in this projection are represented by equally spaced converging straight lines broken at the equator. The central meridian is half as long as the Equator. Parallels are represented by equally spaced straight parallel lines that are perpendicular to the central meridian. Poles are represented by lines half as long as the Equator. This projection is symmetrical about the central meridian or the Equator. Scale is true along latitudes 47°10' N and S, and constant along any given latitude or meridian.
The "Eckert I" projection has the following parameters:
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Longitude of natural origin (central meridian)
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False Easting
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False Northing
Note: Only a spherical form of this projection is used. The semi-major axis of the ellipsoid will be used as the radius of the sphere.