Gemini Constellation
Gemini (The Twins)
Gemini is a prominent constellation in the northern sky, representing the mythological twins Castor and Pollux. It is one of the 13 ecliptic constellations and is easily recognizable by its two bright stars, named after the twins themselves. Gemini is rich in both mythological significance and astronomical features, making it a favorite among stargazers.
Key Features
- Bright Stars: Gemini’s two brightest stars mark the heads of the twins:
- Deep-Sky Objects: Gemini contains several notable celestial objects:
- Messier 35 (M35): A large and bright open star cluster located near the feet of the twins.
- Eskimo Nebula (NGC 2392): A planetary nebula resembling a face surrounded by a parka hood.
Mythological Background
In Greek mythology, Gemini represents the twin brothers Castor and Pollux, the sons of Leda. Castor was mortal, while Pollux was immortal, being the son of Zeus. When Castor died, Pollux pleaded with Zeus to reunite them, leading to their placement among the stars as the constellation Gemini. Their story symbolizes brotherly love, loyalty, and sacrifice.
The constellation also features prominently in Roman and other ancient myths, often as symbols of companionship, strength, and duality.
Cultural Significance
Gemini has been an important constellation for navigation and timekeeping. Its rising and setting times have historically been used to mark seasonal changes. The twins’ association with sailors made them a symbol of protection and guidance during maritime journeys.
Gemini Rise and Set Timetable
| Time | Elevation | |
Moon Rise, 16.7% illuminated  | 00:36 | -27° |
| Gemini Transit | 10:56 | 74° |
| Moon Set | 16:21 | 19° |
| Gemini Set | 18:05 | |
| Astrosession begin | 19:38 | -15° |
| Astrosession end | 02:49 | -9° |
| Gemini Rise | 03:43 | |
| Sunrise | 03:58 | 3° |
Track Gemini Position Throughout the Night
← Sun, 12 July 2026 →
| Time | |
| Altitude | |
| Azimuth |
Nebulae in the constellation Gemini
M35
Open Cluster
Eskimo Nebula (NGC2392)
Planetary Nebula
Annual motion of Gemini
| Date | Sun, 12 July 2026 |
| Twighlight start | 20:15 |
| Twighlight end | 02:00 |
| Twighlight duration | 6h 46m |
| Rise | 03:43 |
| Set | 18:01 |
| Elevation at transit | 74° |
| Transit time | 10:52 |
| Equatorial coordinates | RA: 07h 07m 16s", Dec: 21° 31' 49s |
| Magnitude | - |
| Constellation |
The graph is structured with the vertical axis showing the hours of the day, ranging from 12 AM to 12 AM the next day, while the horizontal axis spans each day of the year.
The reddish shaded area indicates the periods when the Gemini is above the horizon, visible to observers. The white line marks the times when the celestial object reaches its highest point in the sky each day, known as the transit. You can also view detailed visibility information in a dedicated table, including exact 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, which provide a consistent framework for celestial mapping.
Special thanks to Sky & Telescope Magazine and contributors Roger Sinnott and Rick Fienberg for their collaboration in producing the charts and tables. The constellation patterns, drawn by Alan MacRobert, were influenced by the work of H. A. Rey and thoughtfully adjusted to align with earlier traditions.