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
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.