Eridanus can refer to:

Rivers

Eridanos (mythology) The river Eridanos or Eridanus (; grc, Ἠριδανός) is a river in northern Europe mentioned in Greek mythology and historiography Historiography is the study of the methods of historians in developing history as an academic discipl ...

(or Eridanus), a river in Greek mythology, somewhere in Central Europe, which was territory that Ancient Greeks knew only vaguely *The

Po River The Po ( , ; la, Padus or ; Ligurian language (ancient), Ancient Ligurian: or ) is the longest river in Italy. It flows eastward across northern Italy starting from the Cottian Alps. The river's length is either or , if the Maira (river), Mair ...

, according to Roman word usage *

Eridanos (Athens) Eridanos or Eridanus (; grc, Ἠριδανός) was a river in Athens mentioned in Greek mythology and historiography. Mythical stream Eridanus was the 'deep-swirling' river-god son of the Titans Oceanus and his sister-wife Tethys. He was ...

, a former river near Athens, now subterranean *

Eridanos (geology) The name Eridanos, derived from the ancient Greek Eridanos, was given by geologists to a river that flowed where the Baltic Sea is now. Its river system was better known as the "Baltic River System". The Eridanos began about 40 million years a ...

, a former large river that flowed between forty million and seven hundred thousand years ago from Lapland to the North Sea through where the Baltic Sea is now

Astronomy

Eridanus (constellation) Eridanus () is a constellation in the southern celestial hemisphere. It is represented as a river. One of the 48 constellations listed by the 2nd century astronomer Ptolemy, it remains one of the 88 modern constellations. It is the sixth large ...

, a southern constellation *

Eridanus Cluster The Eridanus Cluster is a galaxy cluster roughly from Earth, containing about 73 main galaxies and about 200 total galaxies. About 30% have Hubble classifications of elliptical or S0 and the remaining 70% are spiral or irregular. These gala ...

of galaxies in the constellation Eridanus *

Eridanus II The Eridanus II Dwarf is a low-surface brightness dwarf galaxy in the constellation Eridanus. Eridanus II was independently discovered by two groups in 2015, using data from the Dark Energy Survey ( Bechtol et al., 2015; Koposov et al. 2015) ...

, a low-surface brightness dwarf galaxy in the constellation Eridanus *

List of stars in Eridanus This is the list of notable stars in the constellation Eridanus, sorted by decreasing brightness. See also *List of stars by constellation All stars but one can be associated with an IAU constellation. IAU constellations are areas of the sk ...

Delta Eridani Delta Eridani, which is Latinized from δ Eridani, is a star in the equatorial constellation of Eridanus. The star is visible to the naked eye and has been observed to vary in slightly brightness between magnitudes 3.51 and 3.56, alt ...

, a star *

Eta Eridani Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly ), is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is ap ...

, a star *

Gamma Eridani Gamma Eridani (γ Eridani, abbreviated Gamma Eri, γ Eri), formally named Zaurak , is a variable star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude that varies around 2.9, and lies at ...

, a star *

Eridanus Supervoid Eridanus can refer to: Rivers *Eridanos (mythology) (or Eridanus), a river in Greek mythology, somewhere in Central Europe, which was territory that Ancient Greeks knew only vaguely *The Po River, according to Roman word usage *Eridanos (Athens), ...

, a large-scale cosmic underdensity

Miscellaneous

Éridan (rocket) The Éridan is a two-stage French sounding rocket, which resulted from the use of the Stromboli engine of the Dragon and/or Dauphin as first and second stage. It belonged thereby to a family of solid-propellant rockets from the Belier (rocket), th ...

, a French rocket * ''Éridan''-class minehunter, a class of French naval minehunters *''

Eridanosaurus ''Eridanosaurus'' is an extinct genus originally described as a crocodilian, but later shown to be a rhinocerosDelfino, M. 2001The fossil record of the Italian Crocodylomorpha 6th European Workshop on Vertebrate Palaeontology, Florence-Montevar ...

'', a rhinocerotid originally described as a crocodilian * USS ''Eridanus'' (AK-92), a ship of the United States Navy * Eridan Ampora, a character from the webcomic ''

Homestuck ''Homestuck'' is an Internet fiction series created by American author and artist Andrew Hussie in the first half of the 2010s. The fourth and best-known of Hussie's four ''MS Paint Adventures'', it originally ran from April 13, 2009 to April 1 ...

''. {{disambiguation, geo