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Intercalation (timekeeping)
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== Other uses == [[ISO 8601]] includes a [[ISO week date|specification]] for a 52/53-week year. Any year that has 53 Thursdays has 53 weeks; this extra week may be regarded as intercalary. The ''xiuhpōhualli'' (year count) system of the [[Aztec calendar]] had five intercalary days after the eighteenth and final month, the ''[[nēmontēmi]]'', in which the people fasted and reflected on the past year.
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