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abstraction > mathematical concept > number > quantity > equatorial sky area > asterism

asterism
subject			fact

asterism	is a part of constellation
	has purpose to easily recognize a part of the sky
	has definition a group of bright stars which form a conspicuous pattern on the celestial sphere
	is an instance of equatorial sky area
equatorial sky area	is defined using equatorial coordinates
quantity	has unit
number	has value