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This column is used (in part) to calculate column M. It gives the duration of visibility of the crescent moon on the night of its appearance. | This column is used (in part) to calculate column M. It gives the duration of visibility of the crescent moon on the night of its appearance. | ||
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+ | === Determining eclipses === | ||
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+ | == General approach == | ||
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+ | The Saros cycle |