gnomonic

[ noh-mon-ik ]

/ noʊˈmɒn ɪk /

of or relating to a gnomon or to a sundial.

of or relating to the measurement of time by a gnomon or a sundial.

of, relating to, or noting a map projection in which all great circles are depicted as straight lines: a gnomonic chart.

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Sometimes gno·mon·i·cal

[noh-mon-i-kuhl] /noʊˈmɒn ɪ kəl/ .

1595–1605; <Latin gnōmonicus “of, belonging to a gnomon” <Greek gnōmonikós. See gnomon, -ic

Gnomonic and conical projections are also used for the polar charts, differing little from the foregoing for moderate areas.
Nautical Charts|G. R. Putnam
The distortion, however, is necessarily enormous when the celestial sphere is presented in only six gnomonic maps.
Half-hours with the Telescope|Richard A. Proctor
A modified or composite course can readily be laid out on a gnomonic chart.
Nautical Charts|G. R. Putnam
Another kind of projection in common use is the “gnomonic projection” (fig. 12).
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7|Various