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lunar calendar

any dating system based on a year consisting of synodic months-i.e., complete cycles of phases of the Moon. In every solar year (or year of the seasons), there are about 12.37 synodic months. Therefore, if a lunar-year calendar is to be kept in step with the seasonal year, a periodic intercalation (addition) of days is necessary

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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