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abstraction > mathematical concept > geometrical object > point > coordinate > equatorial coordinate > celestial ephemeris pole

celestial ephemeris pole comparison table

Subject	is an instance of	is a kind of	has definition
equatorial coordinate		coordinate
celestial ephemeris pole	equatorial coordinate		The reference pole for nutation and polar motion; the axis of figure for the mean surface of a model Earth in which the free motion has zero amplitude. This pole has no nearly diurnal nutation with respect to a space-fixed or Earth-fixed coordinate system.

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