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出典:Wiktionary
Friday the 13th (複数形 Fridays the 13th)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/27 16:25 UTC 版)
Friday the 13th occurs when the thirteenth day of a month falls on a Friday, which superstition holds to be a day of bad luck. In the Gregorian calendar, this day occurs at least once, but at most three times a year. Any month's 13th day will fall on a Friday if the month starts on a Sunday.
Friday the 13th