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 158
odyand may be regarded asgiving the latitude and lon-gitude of that point on theearth in whose zenith thebody is found; the zenithdistance (the complement ofthe altitude) indicates thedistance of the observerfrom that point; but there isnothing to show at which ofthe numerous positions ful-filling… … Fig. 54. of miles apart; and each proceeds to work out hisso far as this sight is concerned. It is thereforeclear that a single observation is not enough, in itself, to locate the point occu-pied by the observer, and it becomes necessary, in order to fix the position, toemploy a second circle,…
Navigation · Nautical astronomy
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