[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 145
-6 16 .6 -6 18 .4 L.m.t. June 25 10 59 .3 13 30 .9 June 25 8 8 .4 18 45 .0 CHAPTER VII, LATITUDE. 140. Problem 45. To find the latitude from an observedaltitude of a heavenly body on the meridian. Solution. Let the diagram (Fig. 31) be a projection of thesphere on the plane of the meridian NZS: Z,… … Fig. 81. Let M be the position of the body; Q M = c?, its declination ; MZ = 2 = 90°— A, its zenith distance, which it is conven- k at to mark N. or S., according as the zenith is north or south of the body. From the diagram, we have Q Z = Q M + M Zor, Z = z + d, (108) which is the general formula.…
Navigation · Nautical astronomy
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