- Equinoctial colure
- Solstitial colure
- See also
- References
{{distinguish|Coulure}}Colure, in astronomy, is either of the two principal meridians of the celestial sphere. Equinoctial colureThe equinoctial colure is the meridian or great circle 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 colureThe solstitial colure is the meridian or great circle of the celestial sphere which passes through the poles and the two solstices: the first point of Cancer and the first point of Capricorn. There are several stars closely aligned with the solstitial colure: Pi Herculis, Delta Aurigae, and Theta Scorpii. This makes the solstitial colure point towards the North Celestial Pole and Polaris. See also- Celestial coordinate system
- Ecliptic
- Celestial sphere
- Right ascension
- Equinox
- Solstice
References- {{cite book | first1 = John Brian | last1 = Harley | first2 = David | last2 = Woodward | title = Cartography in the Traditional Islamic and South Asian Societies | series = The History of cartography | volume = 2:1 | publisher = University of Chicago Press | date = 1987 | isbn = 978-0-226-31635-2 | page = 28 | oclc = 13456456 | ol = 9455351M }}
- {{cite book | author = Geminus | authorlink = Geminus | first2 = James | last2 = Evans | first3 = J. L. | last3 = Berggren | title = Geminos's Introduction to the phenomena: a translation and study of a Hellenistic survey of astronomy | publisher = Princeton University Press | date = 2006 | isbn = 978-0-691-12339-4 | page = 130 |oclc = 70232402 | ol = 15978783M }}
- {{cite book | last = Ovason | first = David | title = The Secret Architecture of our Nation's Capital | publisher = Harper Collins | date = 1999 | page = 98 | isbn = 978-006095368-3 | oclc = 50409366 }}
- Kaler, Jim. "Pi Arugiae." Pi Arugia. N.p. 22 Feb. 2008. Web.
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