陰暦のシステム上、今年は９月が二回ある（閏月）ので、今晩の月は二度目の十三夜になるのだそうです。しかもそれは１７１年ぶりだそうです。

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Because of the lunar calendar system this year has intercalary month of September, and tonight’s moon is the second waxing gibbous moon in September that has been admired to be as beautiful as the moon on August 15 in Japan.　Furthermore, they say it happened for the first time in 171 years.

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