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fundamental star

noun, Astronomy.
one of a number of stars with positions that have been determined accurately and that are used as reference stars for the determination of positions of other celestial objects. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  • He introduced new methods for determining the position of the equinox and the right ascension of a fundamental star.

    History of Astronomy George Forbes

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