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 101
of co-ordinates used by astronomers in which the ecliptic is the primarycircle and the vernal equinox the point of origin. The co-ordinates are the Celestial Latitude and Longitude. Thelatitude is measured on secondaries to the ecliptic, called circles of latititde, and the longitude is the arc of… … INSTRUMENTS EMPLOYED IN NAUTICAL ASTRONOMY- 69 CHAPTER II. INSTRUMENTS USED IN NAUTICAL ASTRONOMY 1.—THE SEXTANT. Art. ITS. The most important of the nautical instruments for the purposes of the Navigator is the Sextant,owing to its small dimensions, its adaptability, and its great degree of…
Navigation · Nautical astronomy
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