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abstraction > mathematical concept > geometrical object > sphere > celestial sphere

celestial sphere
subject			fact

celestial sphere	has definition An imaginary sphere of arbitrary radius upon which celestial bodies may be considered to be located. As circumstances require, the celestial sphere may be centered at the observer, at the Earth's center or at any other location.
	is an instance of equatorial sky area
	is an instance of sphere
equatorial sky area	is defined using equatorial coordinates
sphere	has dimensions 3
quantity	has unit
number	has value