Leo Constellation
Leo (The Lion)
Leo is one of the most recognizable constellations in the night sky and one of the 13 ecliptic constellations. Representing a lion, Leo is prominent due to its distinctive shape and its association with several bright stars and fascinating celestial objects. It has been a symbol of strength and royalty throughout history.
Key Features
- Bright Stars: Leo contains several prominent stars that outline the shape of a lion:
- Regulus: The brightest star in Leo, a blue-white main-sequence star, often called the "Heart of the Lion." It is located about 79 light-years away.
- Denebola: The second brightest star, marking the lion's tail. It is a white main-sequence star located about 36 light-years away.
- Algieba: A binary star system that forms part of the lion's mane, consisting of two orange giants.
- Zosma: A white star located along the lion’s back.
- Deep-Sky Objects: Leo is rich in galaxies and clusters:
- Leo Triplet: A group of three spiral galaxies (M65, M66, and NGC 3628) visible in small telescopes.
- Messier 95 (M95): A barred spiral galaxy located near the center of Leo.
- Messier 96 (M96): Another spiral galaxy slightly brighter than M95.
- Messier 105 (M105): An elliptical galaxy accompanied by several smaller galaxies.
Mythological Background
In Greek mythology, Leo represents the Nemean Lion, a fearsome beast with an impenetrable hide. The lion was defeated by Heracles as the first of his Twelve Labors. After slaying the lion, Heracles used its skin as armor, and the lion was placed in the sky by Zeus to commemorate his triumph.
Leo has also been recognized in Babylonian and Egyptian cultures, where it symbolized power and was associated with the Sun during its highest point in the sky.
Cultural Significance
Leo’s bright stars and prominent position along the ecliptic have made it a key constellation for tracking celestial events. Its association with royalty and strength has been reflected in various cultures, and its shape has been easily identifiable since ancient times. During spring in the Northern Hemisphere, Leo dominates the evening sky, making it a favorite for observers.
Leo Rise and Set Timetable
| Time | Elevation | |
Moonrise, 29.9% illuminated  | 10:53 | 62° |
| Leo transit | 12:10 | 68° |
| Sunset | 17:54 | 12° |
| Civil sunset | 18:23 | 6° |
| Astronomical observing session begins | 18:56 | 0° |
| Leo set | 18:57 | |
| Moonset | 20:56 | -21° |
| Astronomical observing session ends | 03:27 | -20° |
| Leo rise | 05:20 |
Track Leo Position Throughout the Night
← 19 August 2026 →
| Time | |
| Altitude | |
| Azimuth |
Nebulae in the constellation Leo
M95
Galaxy
M96
Galaxy
M65
Galaxy
M66
Galaxy
Annual motion of Leo
| Date | Thu, 20 August 2026 |
| Twilight start | 19:28 |
| Twilight end | 02:51 |
| Twilight duration | 7h 22m |
| Rise | 05:20 |
| Set | 18:53 |
| Elevation at transit | 68° |
| Transit time | 12:06 |
| Equatorial coordinates | RA: 10h 51m 55s", Dec: 15° 09' 10s |
| 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.