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 141
orizon, and OZ representing the line to the zenith. Sincethe approximate latitude is 10° S, the equator must be 10° north of the zenith, andOQ is drawn to the north of Z so that the angle ZOQ = 10°. OQ is then the pro-jection of the equator. The body being 20° 30 south2 ^^ of the equator, lay off… … or K=±corr.+<?-90^ If, instead of the formulae for a meridian altitude,the formulae for a reduction to the meridian are re-FiG. 53. quired, there is no change in the figure or the method. The altitude observed before or after noon is correctedto make it the noon altitude by the formula }i = li…
Navigation · Nautical astronomy
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