Gnomonic Projection

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gnomonic projection

[nō′män·ik prə′jek·shən]
A projection for displaying the poles of a crystal in which the poles are projected radially from the center of a reference sphere onto a plane tangent to the sphere.
A projection on a plane tangent to the surface of a sphere having the point of projection at the center of the sphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Gnomonic Projection


central projection, a map projection obtained by projecting the points of a sphere from its center to a tangent plane. The method was proposed by Thales of Miletus in the sixth century B.C. Of all the methods of projecting a sphere, only the gnomonic projection possesses the characteristic that all great circles of a sphere are represented on a plane by straight lines. In view of the considerable distortions in gnomonic projections, they are used chiefly for representing small sections of a sphere (in astronomy and navigation).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.