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Encyclopedia Britannica



ERIDANUS

This article appears in Volume V09, Page 741 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: EMS-EUD
ERIDANUS , or FLuvlus (" 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. 9 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 o2 Eridani (numbered 40
by Flamsteed) was discovered to be a ternary star group by
Herschel
  in 1783; it consists of a closd pair, of magnitudes 9.2 and 10.9, revolving in a period of 18o 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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