Dictionary term
Acrux
Direct answer
Acrux is Alpha Crucis, the brightest star in Crux and a multiple stellar system marking the foot of the Southern Cross.
Acrux is the brilliant foot star of Crux and a major southern navigation anchor.
Acrux is the brilliant foot star of Crux and a major southern navigation anchor.
A symbolic locator, not a substitute for an observational chart at a specific place and time.Quick reference
- Use when
- Draw a line from Gacrux through Acrux and continue it several cross-lengths toward the pole.
- Do not use it for
- The extension gives an approximate direction, not a precise position fix without additional methods.
- Reference category
- Constellations & Star Lore
- Related terms
- Castor, Mimosa, Hadar, Shaula
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The story behind Acrux
The modern name contracts Alpha and Crux; navigators and almanacs helped standardize its widespread use.
Acrux in spiritual tradition
Acrux turns a multiple system into the sharp lower point of a continental-scale compass.
Acrux: fact and faith, kept distinct
This is a factual sky reference. It can support wonder and orientation without turning a measured position or inherited pattern into a claim of fate or private revelation.
Acrux in numerology
Acrux is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Acrux matters
Together with Gacrux it defines the Cross's long axis used to estimate the direction of the south celestial pole.
Acrux at work: an example
A small telescope separates two of Acrux's bright blue-white components.
Where interpretation stops
Acrux is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- IAU Division C Working Group on Star Names - Official IAU working group responsible for standardizing star names used in international astronomy.
- CDS SIMBAD Astronomical Database - Professional astronomical database for stellar identifiers, positions, classifications, and bibliography.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Also appears in
- Constellations & Star Lore
- Aliases
- None listed
- Last updated
- 2026-07-16
Point south through Acrux
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Common questions
What is Acrux?
Acrux is Alpha Crucis, the brightest star in Crux and a multiple stellar system marking the foot of the Southern Cross.
How is Acrux used in an almanac?
Draw a line from Gacrux through Acrux and continue it several cross-lengths toward the pole.
What should I avoid when interpreting Acrux?
The extension gives an approximate direction, not a precise position fix without additional methods.
