A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 63
50 ASTRONOMICAL INSTRUMENTS. time, provided we know its declination and right ascension, andhave the sidereal time ; for which reason a sidereal clock or chro-nometer is an indispensable adjunct of the equatorial. … -inch Princeton Tell To find an object, the telescope is turned in declination until the readingof the declination circle corresponds to the declination of the object, andthen the polar axis is turned until the hour-circle of the instrument (not tobe confounded with an hour-circle in the sky) reads…
Astronomy
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