\Gno*mon"ic\, Gnomonical \Gno*mon"ic*al\, a. [L.
gnomonicus, Gr. ?: cf. F. gnomonique. See {Gnomon}.]
Of or pertaining to the gnomon, or the art of dialing.

{Gnomonic projection}, a projection of the circles of the
   sphere, in which the point of sight is taken at the center
   of the sphere, and the principal plane is tangent to the
   surface of the sphere. ``The gnomonic projection derives
   its name from the connection between the methods of
   describing it and those for the construction of a gnomon
   or dial.'' --Cyc. of Arts & Sciences.