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 177
the altitudes of two different objects at the sametime and plotting the corresponding parallels of position. Since the Navigator knows approximately the ships latitude and longitude, it is necessary to project but alimited j)ortion of the line of position; hence, it may generally be regarded as a… … Fig. 69. Art. 317. Case L By the altitudes of two objects taken at the same time.—Since the position of a shij) isdetermined by the intersection of two lines of position, it can be most accurately determined when the lines inter-sect at right angles ; hence, two objects should be chosen whose…
Navigation · Nautical astronomy
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