Merriman, Mansfield, 1848-1925 · New York Wiley · leaf 153
cision is demanded, to regard the earthas a sphere. Prob. 53. Taking the area of the earths spheroidal surface as196 940 400 square miles, find the radius of a sphere having thesame area. 54. Lines on a Sphere. The intersection of a plane and a sphere is always a circle.When the plane passes… … R, say r, and its circumference is 27rr. All great circles cut out by planes passing through the axis of the earth are called meridians and these, of course, converge and meet at the poles. All small circles cut out by planes perpendicular to the axis are called parallels. Latitude is measured…
Geodesy · Surveying
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