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4 times every 28 years, on the pattern 6 years - then 5 years - then 6 years - then 11 years. [This does not account for non-leap century years, such as 1900 and 2100, which disrupt the pattern.]

In specific years, it happened in 1977, 1983, 1988, 1994, 2005 and 2011. The next two occurrences will be in 2016 and 2022.

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12y ago

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