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    "source_title": "Encyclopaedia Britannica (1911)",
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    "chunk_id": "1911:eridanus:b4bec1b4fcf5",
    "title": "ERIDANUS",
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    "verified_text": "eridanus, or fluvius (\"the river\"), in astronomy, a constellation of the southern hemisphere, mentioned by eudoxus (4th century b.c.) and aratus (3rd century b.c.); ptolemy catalogued 34 stars in it. [theta] _eridani_, a fine double star of magnitudes 3.5 and 5.5, is now of the third magnitude. it is supposed to be identical with the _achernar_ of al-sufi, who described it as of the first magnitude; this star has therefore decreased in brilliancy in historic times. the star [omicron]2 _eridani_ (numbered 40 by flamsteed) was discovered to be a ternary star group by herschel in 1783; it consists of a close pair, of magnitudes 9.2 and 10.9, revolving in a period of 180 years, associated with a star of magnitude 4.5, which is distant from the pair by 82\"; these stars have an exceptionally swift proper motion, about 4\" per annum. eridanus was the ancient name of the river po.",
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