Sphere With Quadrants and Poles

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A sphere with quadrants and poles. “A point on the surface of a sphere, which is at the distance of a quadrant from each of two other points, not the extremities of a diameter, is a pole of the great circle passing through theses points.”




G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 364


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