Eridanus Constellation
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Eridanus, the river, is a large constellation representing a river flowing from the foot of Orion towards the southern sky.
Eridanus Rise and Set Timetable
| Time | Elevation | |
Moon Rise, 91.9% illuminated  | 16:14 | -39° |
| Astrosession begin | 00:30 | -41° |
| Moon Set | 01:36 | -28° |
| Astrosession end | 02:39 | -17° |
| Eridanus Rise | 04:24 | |
| Eridanus Transit | 08:23 | 19° |
Track Eridanus Position Throughout the Night
← Sat, 27 June 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Eridanus changing position in the night sky.
Nebulae in the constellation Eridanus
the Witch Head Nebula (NGC1909)
Reflection Nebula
NGC1909 is a reflection nebula with apparent magnitude in the constellation Eridanus, spanning approximately 3 arcminutes in the sky.
Annual motion of Eridanus
| Date | Sun, 28 June 2026 |
| Twighlight start | 20:21 |
| Twighlight end | 01:50 |
| Twighlight duration | 5h 29m |
| Rise | 04:20 |
| Set | 12:18 |
| Elevation at transit | 19° |
| Transit time | 08:19 |
| Equatorial coordinates | RA: 03h 38m 52s", Dec: -33° 15' 39s |
| Magnitude | - |
| Constellation |
The graph illustrates the annual visibility pattern of a Eridanus, providing a comprehensive overview of its daily appearances and transit times throughout the year.
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 Eridanus 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.
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 Eridanus 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.