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Constellations appear in Western culture via Greece and are mentioned in the works of Hesiod, Eudoxus and Aratus. The traditional 48 constellations, consisting of the zodiac and 36 more (now 38, following the division of Argo Navis into three constellations) are listed by Ptolemy, a Greco-Roman astronomer from Alexandria, Egypt, in his Almagest.
The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930, [b] are defined by a polygon of 30 segments. In the equatorial coordinate system , the right ascension coordinates of these borders lie between 00 h 27 m 03 s and 23 h 41 m 06 s , while the declination coordinates are between 77.69° and 46.68°. [ 3 ]
Lyra (Latin for 'lyre', from Ancient Greek: λύρα; pronounced: / ˈ l aɪ r ə / LY-rə) [2] is a small constellation.It is one of the 48 listed by the 2nd century astronomer Ptolemy, and is one of the modern 88 constellations recognized by the International Astronomical Union.
The official constellation boundaries, as set by Eugène Delporte in 1930, are defined by a polygon of 14 segments. In the equatorial coordinate system , the right ascension coordinates of these borders lie between 20 h 14 m 14.1594 s and 21 h 08 m 59.6073 s , while the declination coordinates are between +2.4021468° and +20.9399471°. [ 1 ]
The Catasterismi or Catasterisms (Greek Καταστερισμοί Katasterismoi, "Constellations" or "Placings Among the Stars" [1]) is a lost work by Eratosthenes of Cyrene. It was a comprehensive compendium of astral mythology including origin myths of the stars and constellations .
The following lists of constellations are available: IAU designated constellations – a list of the current, or "modern", constellations; Former constellations – a list of former constellations; Chinese constellations – traditional Chinese astronomy constellations; List of Nakshatras – sectors along the Moon's ecliptic
The constellation Cepheus as it may be seen by the naked eye. Alderamin, also known as Alpha Cephei, is the brightest star in the constellation, with an apparent magnitude of 2.51. [5] Gamma Cephei, also known as Errai, is the second-brightest star in the constellation, with an apparent magnitude of 3.21. [6]
Perseus is a constellation in the northern sky, named after the Greek mythological hero Perseus.It is one of the 48 ancient constellations listed by the 2nd-century astronomer Ptolemy, [1] and among the 88 modern constellations defined by the International Astronomical Union (IAU). [2]
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