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 141
the noon position, 134 LATITUDE. is 20° 30 S., and it is desired to find the approximate noon altitude and obtain theconstant, K. Draw the circle representing the plane of the meridian (see fig. 53),draw NS representing the horizon, and OZ representing the line to the zenith. Sincethe approximate… … the equator, lay off OM so that the angle QOM =20° 30. SOM will be the approximate altitude, andthe formula for it is approx. 7i = 90° + L - dit is also seen thatSL (5) alt. or If, instead of the formulae for a meridian altitude,the formulsB for a reduction to the meridian are re-no. 53. quired,…
Navigation · Nautical astronomy
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