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lunar cycle

noun
🔊/ˌluːnə ˈsaɪkl/
🔊/ˌluːnər ˈsaɪkl/
 (astronomy天文学)
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  1. a period of 19 years, after which the new moon and full moon return to the same day of the year太阴周，月运周期，默冬章（周期为 19 年，之后月相会在一年的同一天重现）Topics Timec2