Crux Constellation
Crux (The Southern Cross)
Crux, commonly known as the Southern Cross, is the smallest but one of the most recognizable constellations in the night sky. Located in the southern celestial hemisphere, Crux has been an important symbol and navigation aid for cultures in the Southern Hemisphere for centuries. Its compact yet bright arrangement of stars makes it easy to identify.
Key Features
- Bright Stars: Crux is composed of several notable stars that form its iconic cross shape:
- Acrux (Alpha Crucis): The brightest star in Crux, a blue-white multiple star system located about 321 light-years away.
- Becrux (Beta Crucis): A luminous blue giant star, also known as Mimosa, situated about 280 light-years away.
- Gacrux (Gamma Crucis): An orange giant and the third-brightest star in the constellation, located about 88 light-years away.
- Ginan (Epsilon Crucis): A fainter orange star completing the constellation’s shape.
- Deep-Sky Objects: Despite its small size, Crux contains intriguing celestial objects:
- Coalsack Nebula: A prominent dark nebula visible to the naked eye, located near the cross’s southeastern side.
- Jewel Box Cluster (NGC 4755): A vibrant open star cluster with colorful stars, located about 6,440 light-years away.
Mythological and Cultural Background
In various cultures, Crux has been revered as a symbol of guidance, navigation, and spirituality. In Aboriginal Australian traditions, the stars of Crux often represent a stingray or an eagle. To European explorers, Crux became a critical navigation tool during voyages in the Southern Hemisphere, helping to locate the direction of the South Pole.
Christian missionaries associated Crux with the cross of Christ, enhancing its symbolic importance in regions where they spread their teachings.
Cultural Significance
Crux appears on several national flags, including those of Australia, New Zealand, Brazil, Papua New Guinea, and Samoa, symbolizing its importance to the cultures of the Southern Hemisphere. Its use as a navigational aid has made it a key feature in the history of exploration and astronomy.
The constellation’s brilliance and compact shape, along with its proximity to other notable celestial objects like Alpha Centauri, make Crux a favorite among stargazers and an enduring symbol of the southern sky.
Crux Rise and Set Timetable
| Time | Elevation | |
| Crux is always below the horizon | - | |
| Crux transit | 12:55 | -7° |
Moonrise, 96.4% illuminated  | 18:23 | -28° |
| Astronomical observing session begins | 23:23 | -64° |
| Astronomical observing session ends | 03:38 | -56° |
| Moonset | 07:13 | -29° |
Track Crux Position Throughout the Night
← 30 August 2026 →
| Time | |
| Altitude | |
| Azimuth |
Nebulae in the constellation Crux
Annual motion of Crux
| Date | Mon, 31 August 2026 |
| Twilight start | 19:06 |
| Twilight end | 02:59 |
| Twilight duration | 8h 53m |
| Rise | Crux is always down |
| Set | Crux is always down |
| Elevation at transit | -7° |
| Transit time | 12:51 |
| Equatorial coordinates | RA: 12h 20m 04s", Dec: -59° 30' 00s |
| Magnitude | - |
| Constellation |
The vertical axis shows the hours of the day, while the horizontal axis spans the days of the year.
The reddish area marks when the constellation is above the horizon. The white line shows when it reaches its highest point in the sky. View detailed visibility information in a table with rise, transit, and set times for each date.
Acknowledgements
We gratefully acknowledge the International Astronomical Union (IAU) for defining and standardizing the official constellation boundaries used in celestial mapping.
Special thanks to Sky & Telescope Magazine and contributors Roger Sinnott and Rick Fienberg for producing the charts and tables. Alan MacRobert’s constellation patterns were influenced by the work of H. A. Rey and adjusted to align with earlier traditions.