The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 112
l Astronomy may be referred to, or the publications of the Bureanof Navigation, Navy Department, or those of the Coast Survey. INSTRUMENTS EMPLOYED IN NAUTICAL ASTRONOMY. 79 advantageously be used for ascertaining with sufficient approximation the local time, latitude, and direction ofthe meridian.… … I Fig. 55. 80 INSTRUMENTS EMPLOYED IN NAUTICAL ASTRONOMY. lower sign to northern stars with respect to the zenith; the refraction, r, may generally be neglected. The index-error of the finder may readily be removed by pointing to a known star and keeping it between the horizontalthreads when…
Navigation · Nautical astronomy
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