Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 295
maybe found by two distinct methods : (1) By Dead Reckoning, which consists in keeping a recordof the courses and distances sailed from a known point, andcomputing from these data the position reached. (2) By Nautical Astronomy, which consists in finding posi-tion by observations of the heavenly… … Fig. 1. The Mariners Compass To find the position of a ship by observations of celestialbodies requires a knowledge of Nautical Astronomy andSpherical Trigonometry. When a ship is out of sight ofland she is steered by the Mariners Compass. DEFINITIONS 307 A Table of the AnglesWhich every Point and…
Trigonometry · Surveying · Navigation
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