Zenithal Orthographic Equatorial Projection
 Lines of Latitude •Equator •Latitudes Lines of Longitude •Prime Meridian •Longitudes Relationships Facts on Earth Zenithal Projections •Gnomonic Polar •Gnomonic Equatorial •Stereographic Polar •Stereographic Equatorial •Orthographic Polar •Orthographic Equatorial Simple Conic Projection Cylindrical Equal-area Projection References Figure A Figure C                                 Figure D In Orthographic projections, projections of parallels and meridians are created by projecting from a point at infinite distance away from the projection plane, which sit tangential to the other end of the diameter. In the equatorial case, the light source comes from the west of the circle at an infinite distance. As a result, the white rays radiating from that infinite point willl appear to go through the earth parallel to each other (as is the case of AB, CD and EF in Figure A). The projection plane CE is situated tangentially to the east of the equator AB. Like other Zenithal projections, one can think of the orthographic projection as being created by the shadows casted upon the projection plane CE by the parallels and meridians. Figure B When viewed in this perspective, parallels are seen as the horizontal lines in Figure B, which is equivalent to the white lines in Figure C. In both diagrams, the distance between two consecutive latitudes vary. In fact, the parallels appear closer when further away from the equator. The distances that the projected parallels are away from the equator is as follows: Given an arbitrary latitude DG in Figure A, it has the angular distance