The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 136
the shadow whose length is to be meas- ASTRONOMY. 117 ured, and the transverse wires are placed one at each end ofthe shadow, as shown in Fig. 133. The micrometer screw isthen turned till the wires are brought together, so as to ascer-tain the length of the arc between them. We may then formthe… … Fig. 133- The height of the sun above the horizon is ascertainedby measuring the angular distance of the mountain from theterminator. (2) We may measure the distance of a bright point fromthe terminator, and then construct a right-angled triangle,as shown in Fig. 134. A solution of this triangle…
Astronomy
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