- Star Tales - Hydra (ianridpath.com)
Hydra is the largest of the 88 constellations, winding over a quarter of the way around the sky. Its head is south of the constellation Cancer, the crab, while the tip of its tail lies between Libra, the scales, and Centaurus, the centaur. The total length from its westernmost boundary to the easternmost one is 102°.5. Yet for all its size there is nothing prominent about Hydra. Its only star of note is second-magnitude Alphard, a name that comes from the Arabic al-fard appropriately meaning ‘the solitary one’. Bode on his Uranographia atlas gave it the alternative name Unuk es Schudscha, from the Arabic unuk al-shujā, neck of the serpent. Both names were originally given by al-Ṣūfī in his Book of the Fixed Stars (AD 964).
- Hydra (constellation) (Wikipedia)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees, and also the longest at over 100 degrees. Its southern end borders Libra and Centaurus and its northern end borders Cancer. It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy. Commonly represented as a water snake, it straddles the celestial equator.
