File:Astronomy for the use of schools and academies (1882) (14741109316).jpg

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Identifier: astronomyforuseo00gill (find matches)
Title: Astronomy for the use of schools and academies
Year: 1882 (1880s)
Authors: Gillet, J. A. (Joseph Anthony), 1837-1908 Rolfe, W. J. (William James), 1827-1910
Subjects: Astronomy
Publisher: New York : Potter, Ainsworth, & Co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 22. fixed in any declination, and then t The equato?ial tele-scope is mounted ontwo axes, — one par-allel with the axis ofthe earth, and theother at right anglesto this, and thereforeparallel with the planeof the earths equator.The former is calledthe polar axis, andthe latter the declina-tion axis. Each axiscarries a graduatedcircle. These circlesare called respective-ly the hour circle andthe declination circle.The telescope is at-tached directly to the declination axis.When the telescope isurned on its polar axis. 20 ASTRONOMY. the line of sight will describe a diurnal circle ; so that, whenthe tube is once directed to a star, it can be made to fol-low the star by simply turning the telescope on its polar axis. In the case of large instruments of this class, the polaraxis is usually turned by clock-work at the rate at which theheavens rotate: so that, when the telescope has once beenpointed to a planet or other heavenly body, it will continue tofollow the body and keep it ste

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