zenithal adjective. ['zɛnɪƟ(ǝ)l] M19.
[from ZENITH + -AL¹.]
Pertaining to, situated or occurring at, the zenith; fig. supreme, culminating.
zenithal projection a map projection in which a portion of the globe is projected on to a plane tangential to a point on that portion, usu. made the centre of the map.

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