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abstraction > mathematical concept > number > quantity > equatorial sky area > constellation > Eridanus

Eridanus (River Eridanus, Eri)
subject			fact

Eridanus	is a part of celestial sphere
	has genitive Eridani
	has boundary
	has synonym River Eridanus
	has acronym Eri
	is an instance of constellation
constellation	is a part of celestial sphere
	has component asterism
	has historical origin asterism with pictorial or mythical significance
	has purpose to divide the celestial sphere into small visually recognizable star classification regions
equatorial sky area	is defined using equatorial coordinates
quantity	has unit
number	has value