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fundamental star

noun, Astronomy
1.
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.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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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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