A Field Book of the Stars/Hydra
HYDRA (hi'-dra)— THE SEA-SERPENT. (Face South and Southwest.)
Location—The head of Hydra, a striking and beautiful arrangement of stars, lies just below the Bee Hive in Cancer, 6 degrees south of Acubens in that constellation, and forms a rhomboidal figure of five stars.
Hydra is about 100 degrees in length and reaches almost from Canis Minor to Libra. Its stars are all faint except Alphard, or the Hydra's heart, a second-magnitude star remarkable for its lonely situation, southwest of Regulus in Leo. A line drawn from (γ) Leonis through Regulus points it out. It is of a rich orange tint. Castor and Pollux in Gemini point southeast to it.
Hydra is supposed to be the snake shown on a uranographic stone from the Euphrates, 1200 B.C.