A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 240
dian altitudeof a star ?) Xu 236 ASTRONOMY. 539. An Astronomical Clock is a clock adapted to keepexact sidereal time (136). Taking the vernal equinox in the heavens as the zero point, and reckoning 24 hourseastward to the same point again, the time—reckoning 15° to an hour—when an objectcrosses the… … THE MURAL CIRCLE. 540. A Mural Circle is a large graduated circle, witha telescope crossing its center, used for the measurementof the altitudes and zenith distances of the heavenlybodies, at the instant of their crossing the meridian.They are usually fixed upon a horizontal axis, that turnsin a…
Astronomy
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