Conventional International Origin

The Conventional International Origin, abbreviated CIO, is to 1905 determined by a 5-year measurement campaign of 1900 middle northern pole of rotation of the earth.

And performs a slow secular movement towards North America - the Polschwankung - In him the ongoing calibration of the current pole of the earth's rotation, the cyclical movement of several meters radius refers.

The indication of the current polar coordinates is done in arcseconds with respect to the CIO in a 2D Cartesian coordinate system whose x - axis was added to the Greenwich Prime Meridian.

The campaign to establish the CIO also numerous other observatories and institutes involved in addition to the five stations of the International Latitude Service. Today is responsible for monitoring the Earth's rotation, the international Earth Rotation Service (IERS ).

  • Geodesy
  • Geodynamics
  • Astronomical coordinate system
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