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 172
Fig. 60. … Fig. 61. 166 THE SUMNEK LINE. points of the two Sumner lines, in the common longitude, divided by the differenceof the latitude factors (fj — fj), will give the difference of longitude between the pointof intersection and the common meridian when the lines are classified under Case II. The sketch…
Navigation · Nautical astronomy
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