American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 170
P from the common latitutle of A^ and Bj, andits longitude will be a distance A^ O from A^ and B^ O from B,,. Let F^ and F^ repre-sent the longitude factors from Table 47 for the Sumner lines Ai Aj and Bj B2,respectively. Then, since F^ is the difference of longitude corresponding to a changeof 1… … Fig. 57. and, since the known difference of longitude between the points Aj and B^ is com-posed of the sum of A^ O and B^ O in Case I, and the difference of A^ O and Bj O inCase II, we have A, O + B, 0 = A, Bi=OPxF, + OPxF, = OP (Fj + F^), in Case I, andA, O-B, 0=Ai Bi-OPxF,-OPxF; = OP (F.-F^), in…
Navigation · Nautical astronomy
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