Fourth Fundamental Cat and Suppl (FK4, FK4S)
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https://b2find.eudat.eu/dataset/a11a3ff4-50fb-5704-b4eb-a7991e583bc2
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The FK4 was an attempt to establish a fundamental system of stellar positions and proper motions for the 1950 equinox using as much position data as were available. Most of the...
