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Constellation
From Wikipedia, the free encyclopedia
This article is about the star grouping. For other uses, see Constellation (disambiguation). | | | | * Top: Baroque drawing of the constellation Orionfrom Johannes Hevelius' celestial catalogue * Bottom: Contemporary map of Orion from the IAUand photography of the night sky |
In everyday usage, a constellation is a traditional or recognizable group of stars in the night sky, or the region of the sky containing them. In technical usage these meanings have been separated, with groupings of stars being called asterisms, and the word constellation being reserved for a specific area of the celestial sphere with boundaries laid down by the International Astronomical Union (IAU). These areas mostly had their origins in Western-traditional asterisms from which the constellations take their names. When astronomers say something is “in” a given constellation they mean it is within those official boundaries. There are 88 officially recognized constellations, covering the entire sky[1] which have grown from the 48 classical Greek constellations laid down by Ptolemy in the Almagest. Out of these 88 constellations, 12 compose the zodiac signs.
Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located.
Contents
[hide] * 1Terminology * 2History * 2.1Ancient near East * 2.2Chinese astronomy * 2.3Indian astronomy * 2.4Classical antiquity * 2.5Islamic astronomy * 2.6Early Modern era * 3IAU constellations * 4Asterisms * 5Ecliptic coordinate systems * 6Dark cloud

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