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polar sequence

(astronomy) a series of stars in the vicinity of the N celestial pole whose accurately determined magnitudes serve as the standard for visual and photographic magnitudes of stars
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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  • These stars, which are called the polar sequence, all lie in the immediate neighbourhood of the pole.

    Lectures on Stellar Statistics Carl Vilhelm Ludvig Charlier

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