Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 387
night, — usually it is a small hole in a screenwith a lantern behind it, looking like a star as seen throughthe observers telescope. The readings of the circle of thetheodolite then give directly the angle between the signal andthe Pole-star at the moment of each observation, and if thePole-star… … tion of the star, and from this its azimuth, at that moment caneasily be calculated, by means of the PZS triangle, Fig. 125. In this we know the side PZ, thecomplement of the observers latitude;also the side PS, which is the comple-ment of the stars declination; andfinally, we know the hour-angle…
Astronomy · Constellations
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