zenithal projection
A map projection that transforms points from a spheroid or sphere onto a tangent or secant plane. The azimuthal projection is also known as a planar or zenithal projection.
zero length line event ...
on the cylinder, including conical projections (based on the model of a cone, placed with its vertex immediately above one of the poles) and entirely separate families of projections such as two-world equal area projections and zenithal projections.
 See also: Axis, Zenith, Surface, Equator, Projection
  
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