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

Hydra (Water Monster, Serpent of Lerna, Hya)
subject			fact

Hydra	is a part of celestial sphere
	has genitive Hydrae
	has synonym Water Monster
	has synonym Serpent of Lerna
	has acronym Hya
	is an instance of constellation
constellation	has boundary defined in equatorial coordinates
	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