Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 366
the sextant; and at E an index whichmoves over the arc AB. At D is fixed the horizon glass, alsoperpendicular to the plane of the sextant and parallel to CA ;that is, parallel to the index glass when the index is at 0 (A). 376 OBSERVED ALTITUDE OF A HEAVENLY BODY 377 Only one half of the horizon… … >- Fig. 35 To determine the angular distance between two heavenlybodies S and S (Fig. 35), the sextant is held in the hand sothat a ray of light from S passes through the unsilvered partof the horizon glass, enters the telescope, and is seen as if bydirect vision. The arm CE is then moved so…
Trigonometry · Surveying · Navigation
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