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Horologium

The (Pendulum) Clock

Constellation of the southern sky

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GenitiveHorologii
AbbreviationHor
Constellation FamilyLa Caille
Celestial QuadrantSQ1
Right Ascension02h13 to 04h20
Declination-39.6° to -67.0°
Area (sq deg)249
Brightest StarAlpha Horologii
Optimum VisibilityNovember (usually visible from southern latitudes)
NotesOne of fourteen generally faint southern constellations originally defined by Lacaille in 1756, with a shape supposedly representing a clock and its pendulum. The constellation runs southward parallel to the southern stretch of the River Eridanus, but its brightest star, Alpha Horologii, only reaches the relatively faint magnitude of +3.85.
Map of Horologium Map of Horologium

The southern sky is replete with 'mechanical' constellations. The Pendulum Clock is one of these, and like many of the others, it contains only a few faint stars. It lies eastward the brighter star Achernar in Eridanus.

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