A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 50
eal time at ivhich it crosses themeridian; i.e., the number of hours, minutes, and seconds by which itfollows the vernal equinox. Vice versa, if the right ascension is known, the error or correctionof the clock will be determined. The instrument (Fig. 16) consists essentially of a telescope… … Fig. 16. —The Transit Instrument (Schematic). small graduated circle is attached, to facilitate setting the telescopeat any designated altitude or declination. The telescope carries at the eye-end, in the focal plane of theobject-glass, a reticle of some odd-number of vertical wires, — fiveor more,…
Astronomy
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