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abstraction > mathematical concept > number > quantity > equatorial sky area > circumpolar region

circumpolar region
subject			fact

circumpolar region	has coordinates whose equatorial latitude is greater than the Earth latitude of the observer minus 90 degrees
	is a part of celestial sphere
	has purpose to define a part of the sky which can be observed all year at the observers location
	has definition a region defined by an equatorial latitude above which stars are visible all year (depends on observers location on Earth)
	is an instance of equatorial sky area
equatorial sky area	is defined using equatorial coordinates
quantity	has unit
number	has value