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.

gnomic².

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

Sometimes gno·mon·i·cal [noh-mon-i-kuh l] /noʊˈmɒn ɪ kəl/.

Origin of gnomonic

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

gnome, gnomic, gnomist, gnomology, gnomon, gnomonic, gnosia, gnosis, gnossus, gnostic, gnosticism

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