¶ Projective Transformation Model (3)
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Index Entry
Projective Transformation Model:
“We find that these rods remain perpendicular to the surface of the triangle throughout all of their transformations. It doesn’t matter whether the triangle is flat or is spherical or how it is spherical or what the corner angles are. Each one of these rods will be perpendicular to its spherical triangle at its vertex of attachment just as the radii of the Earth are to the great circles. This means that when we take the geometric data of the stars, any star that is in its zenith over the Earth at any given moment will remain in my map in this vertical position over that point on the Earth whether my map is in a planar condition or a spherical condition.”
