The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 136
very accurately known, the first hour-angle found will be an approx-imate one ; the declination foundby this new value of the timewill produce a more exact valueof the hour-angle; and thus pro-ceed until a sufficiently precisevalue is determined. Art. 263. Then know-ing, in Fig. 65, AO = //, the… … Fig. 65.PO =: PD, the polar distance = 90° — d. = 90^ A. PZ = Co-L, the co-latitudeTo find the angle 90^ —OPZ /, the hour-angle of the body O; which may be found from the formul Sin }i t. Eut if it is preferred to use(/,+ !.+ PD) =7( sin ^ (Z + (L - d)) sin J^ (Z - (L - d))\ cos L cos (/ the…
Navigation · Nautical astronomy
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