[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 244
r altitude, or ofthe middle instant, should also be obtained from the chro-nometer times, sufficiently near for finding the declinationof the body. In Fig. 44, letM and M be the two positions of the body,h — 90° — Z M, the first altitude,ti= 90°— Z M, the second altitude,d = 90°- P M = 90° - P M,… … 238 NAVIGATION. The method for finding t is different for different bodies. a. For a fixed star the angle M P M, or t, is the elapsedsidereal time. An elapsed mean time must therefore be re-duced to the equivalent sidereal interval. If, then, S and S represent the sidereal times of the two…
Navigation · Nautical astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
