Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 152
thesuns hour-circle with the vertical plane for agiven hour-angle of the sun, and may be solvedwith the globe as follows : Rectify the globe for latitude 42°, and adjustthe altitude arc to the zenith with its foot atazimuth 66° on the horizon; its plane thencorresponds to that of the dial. Bringing… … Fig. 70. Vertical Dial,Latitude 42° Zenith Distance Hour-Line E.A.M. OF Intersection I Ih 13° II 2 30 ni 3 49 IV 4 70 V 5 90 which gives the angles of the afternoon lines from the noon line.Setting the arc at azimuth 246°, we find in the same way HodS-Line XIX IX vni VII VI V which gives the…
Astronomy
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