Conventional International Origin (CIO) is a conventionally defined reference axis of the pole's average location on the Earth's surface over the year 1900-1905.[1]

Polar motion is the movement of Earth's rotation axis across its surface. The axis of the Earth's rotation tends, as the axis of a gyroscope, to maintain its orientation to inertial space. The Conventional International Origin is used to measure this movement.

References

  1. Muneendra Kumar (2007). "Coordinates : A resource on positioning, navigation and beyond - Blog Archive - The Real Definition of ITRF". mycoordinates.org. Retrieved 2014-05-22.
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