Usage examples (6)

• Affixed to it are gnomonic instruments, made by Ignazio Dante in 1573.
• That map and Ritter's others are considered the first examples of a gnomonic map projection, a method to accurately represent the curvature of the earth on a flat surface.
• The distortion, however, is necessarily enormous when the celestial sphere is presented in only six gnomonic maps.
• The maps depict the entire earth on a central or gnomonic projection, which shows the globe as six faces of a cube.