A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 217
is equal to the co-sine of its opposite side, diminished by the rectangle of the cosines of theadjacent sides, divided by the rectangle of the sines of the adjacentsides. r . cos. ZS— cos. PZ cos. PS 1 hat is, cos. .7^= = n„ .— r>a sin. PZ sin. PS Now, in place of cos. ZS, we take its equal,… … Then cos. P= cos. L sin. D * When the observer is in the northern hemisphere, the polar distance iscounted from the north pole; when in the southern hemisphere, from the southDole. LONGITUDE. 215 From a general equation, in plane trigonometry, we have 2 sin.2 %P=\—cos. PSubstituting the value of…
Surveying · Navigation
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