Planet Earth
International Astronomical Union WGSN

IAU: Hercules

Profile / Characteristics

English translationLatin declination and pronunciationsSize/ °²# stars
(visible)
the HerculesHercules – HER-kyuh-leez
Herculis – HER-kyuh-liss
1225245

Main Star (brightest one):

DesignationHIP numbername in IAU-CSNbrightness
α HerHIP 84345Rasalgethi3.30 mag (V)

Our (modern) Explanation

Hercules is one of the 48 constellations cataloged by the second-century astronomer Ptolemy, but as a nameless Kneeler which had been his name for ancient Greek astronomers since Aratus in the 4th century BCE. It is speculated whether it had a Mesopotamian predecessor but this is currently unproven.

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

the kneeler presses one foot on the head of the snake (Draco), his right hand with a club, in his left hand he carries a lion skin. the constellation depicts him fighting with Draco

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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