Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 401
t upper and lower culmi-nation. One half the sum of thesealtitudes is equal to the altitude ofthe pole, which in turn equals the latitude of the place. (2) Heave-to the ship so as to keep her on the same parallelof latitude until noon of the next day. (3) At noon observe the meridian altitude of… … FlG. 42 * Leckys Wrinkles in Practical Navigation. LONGITUDE BY CHRONOMETER 413 Note. There are, however, two difficulties in carrying out thesedirections in actual practice: (1) As the observer is not supposed to know whether the sun is movingnorth or south, it would be necessary to wait and take…
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
