[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 60
ig. 14. the apparent direction of the star is that of the line A S; and the astronomical re-fraction is the difference of directions of the two lines B Sand A S. This difference of directions is the difference ofthe angles EBS,EDS, which the lines SB,SA makewith any right line C B E, which… … sin ZAS == m, a constant ratio for a given condition of the atmosphere anda given position of A; but varying wTith the density of theatmosphere, and for different elevations of A above the sur-face. For a mean state of the atmosphere and at the sur-face of the earth, experiments give m = 1.000294.…
Navigation · Nautical astronomy
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