Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 46
IURNAL MOTION OF THE STARS As the observations of the moon require but a few minutes eachevening, observations may be made on the same nights upon thestars. The first object is to obtain the diurnal paths of some of thebrighter stars, and as they cast no shadow we must have recovuseto a new method… … Fig. 29 observations so that the zero of its graduation lies as nearly aspossible in the meridian, and a pin with its head removed is placedupright through the center of the circle. A carefully squared rectangular block about 10 inches by 8 inchesby 2 inches is placed against the pin so that the…
Astronomy
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