Actually the "orthographic projection" is what you are used to seeing when you think of the entire earth on a piece of paper. If you look at a map where the entire hemisphere is shown, the closer you get to the poles the more-distorted the distances become. An orthographic projection is a way to try and keep spatial relationships and distances, depicted on the map, true as they can be when not being shown on a globe. its downfall is that the closer you get to the edge of the map, the greater the distortion. Think of looking at a map of the Western Hemisphere where you are centrally-located opposite the equator. Now look at the upper right-hand side, which would be NE, towards Greenland, and you will see Greenland looking almost as-large as the eastern half of Canada, which as "Sketchy" will tell you, is certainly not true! Things lying in the middle half (1/4 above/below the Equator) look OK but bodies at the edge are grossly distorted.