Catalogues of Fundamental Stars

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The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.

Excerpt from the Wikipedia article “Catalogues of Fundamental Stars”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Credit: NASA/JPL-Caltech/S. Stolovy (Spitzer Science Center/Caltech), Public domain, via Wikimedia Commons.