The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 81
aybe used to find the latitude by the fourth method.Art. 78. Bowditchs Navigator contains special tables by whichthe computation, particularly when the sun is observed, may begreatly facilitated. 80. Reduction of the Latitude.—Owing to the spheroidal form of theearth, the vertical line at any… … <0 LONGITUDE. and the poles. It is necessary, then, in refined observations, todistinguish between the geographical zenith, Z, the point wherethe vertical line, when prolonged, meets the celestial sphere, andthe geocentric zenith, Z, the point in which the radius meets thesphere. Since there are…
Astronomy
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