Star lore
Hercules
Direct answer
Hercules is a large northern constellation represented as a kneeling hero and recognized by the four-star Keystone asterism.
Hercules is the Hero, a sprawling summer constellation containing the great cluster M13.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Gemini Constellation, Grus, Horologium, Hydra
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The twelve labors as the year
J. H. Hill reads the twelve labors of Hercules as the sun's passage through the twelve signs, beginning with the lion because the summer solstice then lay in Leo. The second labor, the Hydra, he pairs with a rescue of Virgo. He reads Nimrod, shown in Assyrian marbles and in the constellation Orion with a lion-skin shield and club, as a saviour of the same kind.
He also places the heel of Hercules on the head of Draco in the sky as the picture behind Genesis 3:15. The astronomy of the constellation is fixed. The reading of the labors as a solar calendar is Hill's.
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Hercules in Ptolemy
Ptolemy gives the stars of the constellation named Hercules the nature of Mercury. The same name, Hercules, he gives to Pollux, the star of Gemini, whose nature is Mars, with Castor called Apollo and of Mercury's nature.
The story behind Hercules
The figure was known in antiquity as the Kneeling One and appears among Ptolemy's constellations.
Why Hercules matters
The Keystone gives practical access to M13, one of the brightest globular clusters visible from northern latitudes.
How to read Hercules
Find Hercules between Vega and Arcturus, identify the Keystone, then search one side for M13.
Hercules in practice: an example
Binoculars show M13 as a small round glow; telescopes begin resolving its outer stars.
Where readings of Hercules go wrong
Hercules covers a wide area, so the Keystone alone is not the entire constellation.
Sources and editorial method
Research references used for this entry include:
- International Astronomical Union: The Constellations - Official names, abbreviations, and boundaries for the 88 modern constellations.
- NASA Space Place: What Are Constellations? - NASA introduction to constellation regions, patterns, visibility, and seasonal sky changes.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Last updated
- 2026-09-26
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Common questions
What is Hercules?
Hercules is a large northern constellation represented as a kneeling hero and recognized by the four-star Keystone asterism.
What do people get wrong about Hercules?
Hercules covers a wide area, so the Keystone alone is not the entire constellation.
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