zenithal projection
zenithal projection are constructed by placing a plane tangent to the globe and light is focused on it from various positions to produced an image of the parallels and meridians on the plane. The plane can be tangent to globe and can occupy several positions either at one of the poles, or at any other point. In this projections, the directions of all points from the center of the map remain correct. And therefore it is also called azimuthal projections. The position's of light is vary important because the distance between various lines of latitude is determined by the relatives positions of the point to be projected and the source of light. Accordingly, the zenithal projections can be divided in to three types.
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