A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 64
an hour-circle in the sky) reads the hour-anyle of theobject. This hour-angle, it will he remembered, is simply the difference be- ASTRONOMICAL INSTRUMENTS. 51 tween the sidereal time and the right ascension of the object. The hour-angle is east if the right ascension exceeds the time; west, if it… … Fig. 27. — The Melbourne Reflector. While the instrument cannot give very accurate determinations ofthe positions of bodies by the direct readings of its circles, on accountof the irregular flexures of its axes, it may do so indirectly; that is,it may be used to determine very accurately the…
Astronomy
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