[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 235
rsection may also be readily found by computa-tion, when the lines are regarded as straight.Let Lx and Z2 be the same assumedlatitudes in both computations;and in Figs. 40 and 41, A, the point (Z1? Ax), called thefirst position, B, the point (X2, A2), both derived from the first ob-servation ; C,… … CIRCLES OF EQUAL ALTITUDE. 229 P is the point of intersection, whose latitude L and longi-tude A are required. The diagrams are supposed to be constructed with thedifferences of latitude and longitude, so that in each ACz: X\—Xn the diff. of long, in the lat. LuBD = ?J2—X2, the diff. of long, in…
Navigation · Nautical astronomy
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