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Illustrated Guide to Astronomical Wonders by Barbara Fritchman Thompson, Robert Bruce Thompson

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21Eridanus, The River

NAME: Eridanus (air-uh-DAHN-us)

SEASON: Autumn

CULMINATION: midnight, 10 November

ABBREVIATION: Eri

GENITIVE: Eridani (air-uh-DAHN-ee)

NEIGHBORS: Cae, Cet, For, Hor, Hyi, Lep, Ori, Phe, Tau

BINOCULAR OBJECTS: none

URBAN OBJECTS: none

Eridanus is a dim, large, sprawling, southerly constellation, ranking 6th in size among the 88 constellations. It covers 1,138 square degrees of the celestial sphere, or about 2.8%. From its northern border on the celestial equator near Orion, Eridanus winds its way southwest, terminating near declination -57° at the 0th magnitude star Achernar, which means “the end of the river.” The southerly section of Eridanus, including Achernar, never rises above the southern horizon for observers at ...

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