American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 172
in latitude and longitude,classifying them under Case I or Case II. 2. Take from Table 48 the latitude factors fx and f2,respectively, for the Sumner lines. 3. The difference between the latitudes of the points ofthe two Sumner lines, in the common longitude, divided bythe sum of the latitude… … FIG. 61. 166 THE SUMNER LINE. points of the two Sumner lines, in the common longitude, divided by the differenceof the latitude factors (fx —f2), 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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