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 44
Figures 7 and 8 represent, respectively, examples of easterly and westerly errors.In^botn cases consider that the circles represent the observers horizon, N and Sbeing the correct north and south points in each case. If N and S represent thecorresponding points indicated by a compass whose needle…
Navigation · Nautical astronomy
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