¶ Geodesic Line
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Index Entry
Geodesic Line:
"When two great-circle geodesic lines cross they form two sets of similar angles, any one of which paired with the other, will always add to 180°. (This we also learned in plane geometry.) When any one great circle enters into-- or exits from-- a spherical triangle, it will form the two sets of similar angles as it crosses the enclosing great-circle-edge-lines of that triangle.
“As in billiards or in electromagnetics, when a ball or a photon caroms off a wall it bounces off at an angle similar to that at which it impinged.”
