The USNO-A2.0 Catalogue
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https://b2find.eudat.eu/dataset/91ae92ef-34c5-5749-8c16-21bf8b28a149
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USNO-A2.0 is a catalog of 526,280,881 stars, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans that were the basis for the USNO-A1.0 catalog. The...
