Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 311
the centre of the horizontal circle—we havethe alt-azimuth. In the description of the instruments used in Tychosobservatory (Chapter IV.), we described another instru- 288 STARGAZING : PAST AND PRESENT. [book IV. ment by wliicli Tyclio and the Landgrave of Hesse-Casselendeavoured to make… … Fig. 132.—Theodolite. If we refer again to Fig. 18, we see the method bywhich Tycho tried to get the two co-ordinates. On thehorizontal circle there are the graduations for azimuth,or the measurement from the south along the horizon,and on the vertical quadrant are the graduations for eijAP. XIX.]…
Astronomy · Telescopes
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