Colure

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Orange = equinoctial colure
Blue = solstitial colure
G = equinoctial colure
H = solstitial colure

Colure, in astronomy, is either of the two principal meridians of the celestial sphere.

Equinoctial colure[edit]

The equinoctial colure is the meridian of the celestial sphere which passes through the celestial poles and the two equinoxes: the first point of Aries and the first point of Libra.

Solstitial colure[edit]

The solstitial colure is the meridian of the celestial sphere which passes through the poles and the two solstices: the first point of Cancer and the first point of Capricorn.

References[edit]

  • John Brian Harley, David Woodward. The History of cartography, Volume 2. Oxford University Press US, 1987. ISBN 978-0-226-31635-2. Page 28.
  • Geminus, James Evans, J. L. Berggren. Geminos's Introduction to the phenomena: a translation and study of a Hellenistic survey of astronomy. Princeton University Press, 2006. ISBN 978-0-691-12339-4. Page 130.
  • Ovason, David. "The Secret Architecture of the Nations Capital. Harper Collins 1999. Page 98.

See also[edit]