Stereographic Projections. Jacqueline Hess. History. Earliest known uses were in Greece for map making Earliest references in literature (Roman, ~100 B.C.) Vitruvius ~ Ten Books on Architecture Ptolemy’s ~ Representation of the Sphere in the plane
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It is projected from the center of the earth. It is also called the “Central Projection,” or simply “Gnomic.” This projection displays less than half of the earth:
The Gnomonic projection is very distorted in all but one respect: Great Circles are always displayed as straight lines. That's right, any straight line drawn on a Gnomonic map will be the shortest distance between two points. The scale will be badly distorted along the line, but the route will be precise for the sphere.