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：2025/12/06
clockstar
（ plural ）
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(astronomy) A bright star with precisely known right ascension, used for determining the error of clocks used to time meridian transits
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clockstar
The observatory staff used a clockstar—one with a precisely known right ascension—to determine the error in the meridian clock.
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The observatory staff used a clockstar—one with a precisely known right ascension—to determine the error in the meridian clock.
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