[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 218
s 8.5. LONGITUDE.—LUNAR DISTANCES. 211 In Fig. 35, let m and S be the apparent places of themoon and other body; m1 and S, their true places. The true and apparent places of each are on the same ver-tical circle, Z m, Z S respectively, since they differ only byrefraction and parallax, which act… … and in the triangle m Z S,h Uei Fig. 35. m S = JD Z m = 90°— h Y being given,ZS = 90°--Znto find the angle Z, we have by Sph. Trig. (32),*2 cos j Qi + #+ D) cos j (ft + E-L) 4 cos h cos i/ Then in the triangle m Z S, Z m= 90°- A and Z S= 90°-J7;being given, m! S may be found by Sph. Trig. (I7),f…
Navigation · Nautical astronomy
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