|Symbolism||the Pendulum Clock|
|Right ascension||3 h|
|Area||249 sq. deg. (58th)|
|Stars with planets||2|
|Stars brighter than 3.00m||0|
|Stars within 10.00 pc (32.62 ly)||1|
|Brightest star||α Hor (3.85m)|
|Nearest star||GJ 1061
(11.99 ly, 3.66 pc)
|Visible at latitudes between +30° and −90°.
Best visible at 21:00 (9 p.m.) during the month of December.
Horologium is a small and faint constellation in the southern sky (declination around −60 degrees). Its name is a Latin transliteration of the Greek  word for clock (Horo [ὥρο]- meaning hour and logium [λέγειν] meaning teller [horologium= the hour-teller]).
Horologium does not have any bright stars. Alpha Horologii, the brightest, is an orange giant of magnitude 3.9, 117 light-years from Earth. Beta Horologii is a white giant of magnitude 5.0, 314 light-years from Earth. However, Horologium does have several variable stars. R Horologii is a red giant Mira variable with a very wide range, 1000 light-years from Earth. It has a minimum magnitude of 14.3 and a maximum magnitude of 4.7; its period is approximately 13 months.
Horologium is also not home to many deep-sky objects; there are several globular clusters in the constellation. NGC 1261 is a globular cluster of magnitude 8, 44,000 light-years from Earth. The globular cluster Arp-Madore 1 is found in the constellation, the most remotely known globular cluster in the Milky Way at a distance of 398,000 light years.
- Ridpath, Ian; Tirion, Wil (2001), Stars and Planets Guide, Princeton University Press, ISBN 0-691-08913-2
- Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London. ISBN 978-0-00-725120-9. Princeton University Press, Princeton. ISBN 978-0-691-13556-4.
|Wikimedia Commons has media related to Horologium.|
- The Deep Photographic Guide to the Constellations: Horologium
- Starry Night Photography - Horologium Constellation
- Star Tales – Horologium
- Horologium Constellation at Constellation Guide