Star lore
Horologium
Direct answer
Horologium is a faint southern constellation named for a pendulum clock and located between Eridanus, Dorado, and Reticulum.
Horologium is Lacaille's Clock, an inconspicuous far-southern constellation.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Grus, Hercules, Hydra, Hydrus
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The story behind Horologium
Lacaille introduced Horologium in the eighteenth century, originally depicting a clock with a pendulum.
A one-minute story
The Road of the Sun
Where the twelve signs came from, and why they carry the names they do.
Why Horologium matters
Horologium records the precision-timekeeping instruments central to the scientific age in which the southern sky was remapped.
Horologium in practice: an example
Alpha Horologii is the sole star brighter than magnitude four and the best naked-eye confirmation.
Where readings of Horologium go wrong
The constellation is not a celestial clock face and does not by itself indicate time.
Sources and editorial method
Research references used for this entry include:
- International Astronomical Union: The Constellations - Official names, abbreviations, and boundaries for the 88 modern constellations.
- NASA Space Place: What Are Constellations? - NASA introduction to constellation regions, patterns, visibility, and seasonal sky changes.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Last updated
- 2026-09-26
Find the Clock between river and clouds
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Common questions
What is Horologium?
Horologium is a faint southern constellation named for a pendulum clock and located between Eridanus, Dorado, and Reticulum.
What do people get wrong about Horologium?
The constellation is not a celestial clock face and does not by itself indicate time.
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