Planet Earth
International Astronomical Union WGSN

IAU: Orion

Profile / Characteristics

English translationLatin declination and pronunciationsSize/ °²# stars
(visible)
the HunterOrion – oh-RYE-un, uh-RYE-un
Orionis – or-eye-OH-niss
594205

Main Star (brightest one):

DesignationHIP numbername in IAU-CSNbrightness
bet OriHIP 24436Rigel0.13 mag (V)

Our (modern) Explanation

Orion, The Hunter in Greek mythology, has been a male figure also in Egypt and Babylon, the latter depicting him as “True Shepherd of Heaven”, a pre-zodiac “path of the moon”-constellation. In Babylonian terminology, the planets are called “sheep”, so the “shepherd of heaven” guards the planets. The modern (1920s) definition of the boundary places the it a half degree below the ecliptic, so that the Sun never stands in Orion – but the Moon and the planets do.

Ancient Globes

depiction of this constellation on the Farnese Globe (2nd century CE)
depiction of this constellation on the Kugel Globe (1st century BCE)
depiction of this constellation on the Mainz Globe (2nd century CE)

Farnese Globe

Kugel Globe

Mainz Globe

Ancient Lore & Meaning

Aratus

Reference:
English translation by Douglas Kidd (1997).
Aratus: Phaenomena, Cambridge Classical Texts and Commentaries, Series Number 34

Online available: translation by Mair (1921) 

Pseudo-Eratosthenes

References:
French translation by:
Jordi Pàmias i Massana and Arnaud Zucker (2013). Ératosthènes de Cyrène – Catastérismes, Les Belles Lettres, Paris

English version in:
Robin Hard (2015): Eratosthenes and Hyginus Constellation Myths with Aratus’s Phaenomena, Oxford World’s Classics

Early Modern Interpretation

Contemporary

As one of their first tasks in the 1920s, the newly founded International Astronomical Union (IAU) established constellation standards. The Belgian astronomer Eugène Delporte was assigned to the task to define borders of constellations parallel to lines of declination and right ascension. They were accepted by the General Assembly in 1928. The standardized names and abbreviations had already been accepted in 1922 and 1925.  

current IAU-star chart
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