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单词 gnomonic projection
释义

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.- Cyc. of Arts & Sciences.

See also: Gnomonic

Gnomonic Projection


gnomonic projection

[nō′män·ik prə′jek·shən] (crystallography) 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. (mapping) A projection on a plane tangent to the surface of a sphere having the point of projection at the center of the sphere.

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).

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