A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 28
by that of the vernal equinox. The Sidereal Time at any moment may be denned as the hour-angle of the vernal equinox. It is sidereal noon, when the equinoctialpoint is on the meridian; 1 oclock (sidereal) when its hour-angleis 15° ; and 23 oclock when its hour-angle is 345°, i.e., when the ver-nal… … Fig. 5. — Hour-Circles, etc. 0, place of the Observer; Z, his Zenith.SENW, the Horizon. POP, line parallel to the Axis of the Earth.Pand P, the two Poles of the Heavens.EQWT, the Celestial Equator, or Equinoctial.X, the Vernal Equinox, or First of Aries.PXP, the Equinoctial Colure, or Zero Hour-…
Astronomy
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