Horologium constellation: how to find it, when to see it and what is in it
In short
Horologium (Hor) is a southern constellation covering 249 square degrees, number 58 of 88 by size. It has no bright stars — the brightest is magnitude 3.9, so you need a dark sky. It is best seen in the evening in December. It never rises over London — it is visible south of 27° north. Its neighbours in the sky: Caelum, Dorado, Eridanus, Hydrus, Reticulum.
Area: 249 square degrees, 58 of 88 · Neighbours: Caelum, Dorado, Eridanus, Hydrus, Reticulum · Updated 10 October 2026
How to find Horologium
- 1
Where it is visible
The constellation rises above the horizon south of 27° north and is well seen from the southern hemisphere.
- 2
Use the neighbours
Find it from the neighbouring constellations: Caelum, Dorado, Eridanus, Hydrus.
- 3
Brightest stars
The brightest stars of the figure: α Hor (3.9ᵐ), μ Hor (5.1ᵐ), ζ Hor (5.2ᵐ).
When it is visible over London
| Month | Where and when | Conditions |
|---|---|---|
| January — december | — | never rises |
Stars of the constellation
| Star | What it is | Magnitude |
|---|---|---|
| α Hor | orange giant | 3.9ᵐ |
| μ Hor | yellow-white subgiant | 5.1ᵐ |
| ζ Hor | yellow-white subgiant | 5.2ᵐ |
Horologium FAQ
When is the best time to see Horologium?
Where is Horologium in the sky?
What is the brightest star in Horologium?
Neighbouring and other constellations
Related
Constellation lines: Stellarium, CC BY-SA · star names: IAU WGSN, CC BY 4.0