Star lore
Crux Constellation
Direct answer
Crux Constellation is the smallest official IAU constellation and forms the four-star Southern Cross used for southern-sky orientation.
Crux is the compact Southern Cross, a major landmark beside Centaurus.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Corvus, Crater, Delphinus, Dorado
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The story behind Crux Constellation
Crux Constellation’s stars were known in antiquity within Centaurus; early modern charts separated Crux as southern exploration expanded.
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Why Crux Constellation matters
Crux Constellation’s long axis points roughly toward the south celestial pole, while the nearby Coalsack is a conspicuous dark nebula.
How to read Crux Constellation
Extend the Acrux-to-Gacrux axis several times toward the south pole, checking the Southern Pointers to reject false crosses.
Crux Constellation in practice: an example
Acrux marks the foot and Gacrux the top of the cross's long axis.
Where readings of Crux Constellation go wrong
Crux is the official constellation behind the existing common term Southern Cross; nearby asterisms can imitate its shape.
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
Use the true Cross to face south
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Common questions
What is Crux Constellation?
Crux Constellation is the smallest official IAU constellation and forms the four-star Southern Cross used for southern-sky orientation.
What do people get wrong about Crux Constellation?
Crux is the official constellation behind the existing common term Southern Cross; nearby asterisms can imitate its shape.
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