The Eridanus constellation is a prominent constellation in the southern sky, representing a river. It is one of the largest constellations, stretching across a significant portion of the sky. Eridanus contains several notable stars, including Achernar, which is one of the brightest stars visible from Earth. Eridanus is home to various deep-sky objects, such as the Eridanus Supervoid, a vast region of space with fewer galaxies than expected. The constellation is best viewed during the months of November to February, making it a popular target for stargazers in the southern hemisphere.