Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 323
he atmosphere, but this variation is not taken into account inthis chapter. Dip of the Horizon. Let BH (Fig. 23) represent the level of the sea, 0 the posi-tion of the observer at the height OB above the sea-level, Cz the centre of the earth, and H the farthestpoint on the surfaceof the earth… … PARALLAX. 61 true horizon, from which the apparent altitude of the body isestimated. 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…
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
