Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 324
timated. The dip = angle HOW. The dip is very nearly proportional to the square root ofthe height of the observer above the sea-level. Its effect evi-dently is to increase the observed altitude of a heavenly body;hence, the correction for dip must be subtracted from theobserved altitude. This… … Fig. 24. Let 8 (Fig. 24) represent the body, 0 the position of theobserver, C the centre of the earth, and Z the zenith of theobserver. The geocentric parallax is the angle 8=Z08-ZC8 62 NAVIGATION. ZOS is the apparent zenith distance, and ZCS the geo-centric or true zenith distance. It is evident…
Trigonometry · Surveying · Navigation
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