High Quality Content by WIKIPEDIA articles! Eridanus is one of the 88 modern constellations, and it is the sixth largest in terms of area of the sky. Although the center of Eridanus is at RA 3.25h and Dec -29°, it actually stretches from close to the galactic plane to its brightest optical star Achernar. The nebula known as the Milky Way does not pass through Eridanus, but the celestial equator does. Like the Sun the optical star Achernar is in the Milky Way. The astronomy of Eridanus is a branch of science that deals with or focuses on celestial objects that occur within or at the borders of Eridanus, their magnitudes, motions, and the materials of these celestial bodies, their general exterior and interior constitution, in relation to space and the physical universe as a whole.

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