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Published online by Cambridge University Press: 03 August 2017
The earth rotation parameters and coordinates of optical astrometric stations from 1962. O to 1986. O are estimated simultaneously on the assumption that the system of selected standard stations does not rotate. Longitudes and latitudes of the stations are determined every 2 months. Disagreement of the ERPs with those obtained by the space techniques decreased much compared with the published ERPs of the IPMS. It is expected that the ERPs in the whole period are also improved significantly.