The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 129
rallax in alti-tude is then the angleat the heavenly bodysubtended by theradius of the earth. If the heavenlybody is in the hori-zon as at H, theradius being at rightangles to AH sub-tends the greatest pos-sible angle at the starfor the same distance,and this angle is calledthe horizontal… … Fig. 6i. R = AC, the radius of the earth. D ^ CS, distance of the object from the centre of the earth. Then the triangle of ASC gives R sin Z / • r* * /-«sm par := — , (since SAC = iSqC SAZ) If the object is in the horizon at H*, the angle AIIC is the horizontal parallax, and denoting it by H. P.…
Navigation · Nautical astronomy
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