Gno"mon(?), n. [L. gnomon, Gr. one that knows, the index of a sundial. See Gnome.]
(Dialing) The style or pin, which by its shadow, shows the hour of the day. It is usually set parallel to the earth's axis.
(Astron.) A style or column erected perpendicularly to the horizon, formerly used in astronomocal observations. Its principal use was to find the altitude of the sun by measuring the length of its shadow.
(Geom.) The space included between the boundary lines of two similar parallelograms, the one within the other, with an angle in common; as, the
bcdefg of the parallelograms
af. The parallelogram
bf is the complement of the parallelogram
4. The index of the hour circle of a globe.
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.
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