Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 31
no matter to what part ofthe heavens it has been pointed. The horizontal and vertical axes carry each a pointer.These pointers move over the graduated circles, and markhow far each axis turns. To find the azimuth of a star, the instrument is turnedon its vertical axis till its vertical circle is… … Fig. 16. reading of the horizontal circle is again noted. The differ-ence between these two readings of the horizontal circlewill be the azimuth of the star. ASTRONOMY. IS To find the altitude of a star, the reading of the verticalcircle is first ascertained when the telescope is pointed…
Astronomy
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