zenithal

[ zee-nuh-thuhl or, especially British, zen-uh- ]

adjective

of or relating to the zenith; situated at or near the zenith.
(of a map) drawn to indicate the actual direction of any point from the center point.

Origin of zenithal

First recorded in 1855–60; zenith + -al¹

All round the horizon is built a black cloud-wall, but the zenithal heaven is clear.
Hours of Exercise in the Alps | John Tyndall
It is clear that perspective and zenithal projections are particular groups of conical projections.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 6 | Various
This gives either the group of conical projections with rectified meridians, or as a particular case the equidistant zenithal.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 6 | Various
Of the above 25 projections, 23 are conical or quasi-conical, if zenithal and perspective projections be included.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 6 | Various
It is obvious that all perspective projections are zenithal.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 6 | Various

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