Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 175
Fig. 110 The Altitude of a star is its angular distance, DM, measuredon a vertical circle, above the horizon. The complement, MZ,of the altitude is called the Zenith Distance. The Azimuth of a star is the angle PZM at the zenith formedby the meridian of the observer and the vertical circle…
Trigonometry · Surveying · Navigation
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-128-0.webp)
