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International Earth Rotation and Reference Systems Service

Celestial Intermediate Pole

Acronym: CIP

The CIP is an intermediate pole separating the motion of the pole of the ITRS in the GCRS (Geocentric Celestial Reference System) by dividing nutation from polar motion explicitly at the 2-day nutation period.

Nutations with periods less than two days are modeled by their equivalent polar motion.

Related terms: