Horologium Constellation
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Horologium, the clock, is a faint southern constellation named by Nicolas-Louis de Lacaille to honor timekeeping.
Horologium Rise and Set Timetable
| Time | Elevation | |
Moonrise, 31.2% illuminated  | 23:22 | -14° |
| Moonset | 14:56 | -75° |
| Astronomical observing session begins | 18:26 | -56° |
| Horologium rise | 02:08 | |
| Horologium transit | 03:26 | 2° |
| Astronomical observing session ends | 03:45 | 2° |
| Civil sunrise | 04:17 | 1° |
| Sunrise | 04:44 | 0° |
| Horologium set | 04:45 |
Track Horologium Position Throughout the Night
← 7 September 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Horologium changing position in the night sky.
Nebulae in the constellation Horologium
IC1903
Galaxy Pair
IC1903 is a galaxy pair with apparent magnitude in the constellation Horologium, spanning approximately 1.9 arcseconds in the sky.
IC1942
Galaxy Pair
IC1942 is a galaxy pair with apparent magnitude in the constellation Horologium, spanning approximately 0.7 arcseconds in the sky.
NGC1252
Open Cluster
NGC1252 is an open cluster with apparent magnitude in the constellation Horologium, spanning approximately 7.2 arcseconds in the sky.
NGC1261
Globular Cluster
NGC1261 is a globular cluster with apparent magnitude 8.63 in the constellation Horologium, spanning approximately 5.1 arcseconds in the sky.
NGC1433
Galaxy
NGC1433 is a galaxy with apparent magnitude 9.95 in the constellation Horologium, spanning approximately 6.2 arcseconds in the sky.
Annual motion of Horologium
| Date | Mon, 7 September 2026 |
| Twilight start | 18:54 |
| Twilight end | 03:07 |
| Twilight duration | 8h 13m |
| Rise | 02:08 |
| Set | 04:45 |
| Elevation at transit | 2° |
| Transit time | 03:26 |
| Equatorial coordinates | RA: 03h 25m 31s", Dec: -50° 57' 42s |
| Magnitude | - |
| Constellation |
The graph illustrates the constellation’s annual visibility pattern and its daily rise, set, and transit times throughout the year.
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.
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.