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hour circle

noun

, Astronomy.
  1. a great circle on the celestial sphere passing through the celestial poles and containing a point on the celestial sphere, as a star or the vernal equinox.


hour circle

noun

  1. a great circle on the celestial sphere passing through the celestial poles and a specified point, such as a star


hour circle

  1. A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles. An hour circle is equivalent to a meridian on Earth and is used in describing the position of a celestial body with respect to an observer's celestial meridian.
  2. See more at hour angle


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Word History and Origins

Origin of hour circle1

First recorded in 1665–75

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hour anglehourglass