日曜日から始まる閏年
1. Leap year starting on SundayThis is the calendar for any leap year starting on Sunday, January 1, such as 1956, 1984, 2012, 2040, or 2068. This is the only leap year with three occurrences of Friday the 13th, each three months apart in January, April, and July (common years starting on Thursdays share this characteristic). Uniquely, the instances of Friday the 13th are also 13 weeks apart from one another. They usually occur in 28 year intervals. Exceptions happen when there is no leap year on the beginning of a century.
Read “Leap year starting on Sunday” on English Wikipedia
Read “日曜日から始まる閏年” on Japanese Wikipedia
Read “Leap year starting on Sunday” on DBpedia
Read “Leap year starting on Sunday” on English Wikipedia
Read “日曜日から始まる閏年” on Japanese Wikipedia
Read “Leap year starting on Sunday” on DBpedia
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