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Pronunciation varies by accent · noun
(astronomy) A bright star with precisely known right ascension, used for determining the error of clocks used to time meridian transits.
Use clock star when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Clock star means (astronomy) A bright star with precisely known right ascension, used for determining the error of clocks used to time meridian transits.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use clock star where its definition matches the intended context.
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