Projecting sphere onto plane {normal projection} can use plane tangent at equator.
Projecting sphere onto plane {oblique projection, zenithal} can use plane tangent to sphere at point that is neither at pole nor on equator. Pole can be not at map center.
Projecting sphere onto plane {polar projection} can use plane tangent at pole. Pole can be at map center {transverse projection} or offset from center.
3-Geometry-Projections-Sphere To Plane-Zenithal
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Date Modified: 2022.0225