Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 58
ade by a slight motion of the northleveling screw to bring the level exactly into the horizontal position,the vertical circle having been set to the co-latitude for this purpose. The proper adjustment of the altazimuth is simpler, since itdepends only on the use of the level, while to place an… … Fig. 34 46 LABOKATORY ASTROJTOMY with tlie time, the hour-angle changes uniformly with the time,and the. declination remains the same. One advantage of thelatter system of coordinates is that in repeating our observationson the same star after the lapse of an hour, we need only setthe declination…
Astronomy
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