Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 189
shall become equal to the difference of longitude between band b: then,bb^ will be to p^p, as the cosine of the latitude of b% to radius. But, bb : pp : : Ab : Ap: hence, Ab : Ap : : cos. lat. of bb : radius; that is, if the latitude be so increased that pp shall become thetrue difference of… … PRINCIPLES OF NAVIGATION. 185 by d^ the increased or meridional difference of latitude by D, thelatitude of hh by Z, and the radius by 1, which is, indeed, theradius of the tables of natural sines, and we shall have d D : : cos. I : 1,which gives D=d secant /, since L=sec. l. COS. / If then, we…
Surveying · Navigation
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