The Water Snake
Hydra
Genitive: Hydrae · abbreviation Hya
Best evening month
April
Visible from
90°S to 68°N
Centre RA
10h 00m 00s
Centre Dec
−22° 00′
In your sky
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Mythology & origin
The many-headed Hydra of Lerna, slain by Heracles in his second labour. It is the largest of the 88 constellations.
Ptolemy · Almagest, 2nd century AD