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abstraction > mathematical concept > geometrical object > plane > equator > celestial equator

celestial equator
subject			fact

celestial equator	has definition Projection of the Earth's equator as a line across the sky (so that to an observer actually on the equator, such a line would pass through the zenith). The directional bearing of a star is given in terms of its right ascension round the celestial equator.
	is a kind of equator
plane	has dimensions 2