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Secular polar motion - reality or artefact?

Vondrák, Jan

The long-periodic variations of latitude at twelve observatories are used to determine secular and long-periodic polar motion in the interval 1901.0-1991.0. The Hipparcos Catalogue is used as a homogeneous and most accurate realization of International Celestial Reference System (ICRS) in optical wavelength. To derive polar motion components x, y,…