Earth Orientation Catalog 4 (EOC-4)
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https://b2find.eudat.eu/dataset/98e1a5ef-6490-5fd7-ab28-f6bf84623d52
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The astrometric ground-based observations of latitude / universal time variations, covering the interval 1899.7-2003.0, were used in combination with Hipparcos / Tycho positions...
