Central Meridian: Straight line half as long as the Equator.
Other Meridians: Equally spaced portions of hyperbolas intersecting at the poles and concave toward the central meridian.
Parallels: Equally spaced straight parallel lines, perpendicular to the central meridian.
Symmetry: About the central meridian or the Equator.
Scale is true along the 21º14' parallels and is constant along any parallel, between any pair of parallels equidistant from the Equator, and along the central meridian. It is not free of distortion at any point. This projection is not equal-area, conformal, or equidistant.
For this projection, only one standard parallel is specified. The other standard parallel is the same latitude with the opposite sign. The standard parallel is by definition fixed at 21º14'.
This projection is available only for the sphere.
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