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HYDRA

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Originally appearing in Volume V14, Page 34 of the 1911 Encyclopedia Britannica.
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HYDRA , in See also:

astronomy, a See also:constellation of the See also:southern hemisphere, mentioned by See also:Eudoxus (4th See also:century B.C.) and See also:Aratus (3rd century B.c.), and catalogued by See also:Ptolemy (27 stars), Tycho See also:Brahe (19) and See also:Hevelius (31). Interesting See also:objects are: the nebula H. I V. 27 Hydrae, a planetary nebula, gaseous and whose See also:light is about equal to an 8th magnitude See also:star; Hydrae, a beautiful triple star, composed of two yellow stars of the 4th and 6th magnitudes, and a See also:blue star of the 7th magnitude; R. Hydrae, a See also:long See also:period (425 days) variable, the range in magnitude being from 4 to 9.7; and U. Hydrae, an irregularly variable, the range in magnitude being 4.5 to 6.

End of Article: HYDRA

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HYDERABAD, or HAIDARABAD 		[next]
HYDRA (or SDRA, NIDRA, IDERO, &c.; anc. Hydrea)

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