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Horologium Oscillatorium, the pendulum clock, lies eastward of Achernan, the alpha of Eridanus, and north of Hydrus. Whitall described it in his planesphere as being between Chemica Fornax and Caela Scuptoris.
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| Symbol | Hor |
| Right Ascension |
03:40
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| Declination | -50 |
| Diameter (°) | 21 |
| Area (square °) | 249 |
| Opposition |
Nov 19
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| Size Rank |
58th
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| Brightness Rank |
83rd
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| Genitive | Horologii |
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