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Eridanus is best seen from November through February.
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Eridanus

Eridanus is known as the Celestial River. It most often related to the Nile or Euphrates Rivers because they were so important to ancient civilizations. Eridanus is the second longest constellation in the night sky.

The brightest star is called Achernar. This star is at the southern end of the constellation, and is rarely seen in the Northern Hemisphere. The other tip is held by Cursa. It sets next to the bright star Rigel in the constellation Orion.

With some difficulty Eridanus can be traced through the sky. Once you find Cursa, follow the stars east and south. Most of the Northern Hemisphere can only see the top half of this long figure. Those living below the Equator can continue through the strands of lights until they reach Achernar.

There are over three dozen faint galaxies within Eridanus.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF