Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 23
elow) the path at bothextremities, the compasses must be opened (or closed) slightly andthe assumed pole shifted directly away from (or toward) the middleof the path. The proper opening of the compasses is thus quickly determinedas well as a close approximation to the position of the pole. Placethe… … Fig.13 THE DIURNAIi MOTION OF THE SUN 11 to the path by shifting the steel point on the sphere in the planeof the compass legs, that is, along the great circle from p to s. From the point thus found a circle can be described with thecompasses so as to pass approximately through all the…
Astronomy
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