Olivian Calendar

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http://boondox.org/vague/olivian.htm

Another 13-month calendar proposal, this one lightly humorous. Common to all 13-month calendar propositions are 13 months of four weeks and 28 days. In this way, January 1 falls on the same weekday, year after year, unlike the current calendar, in which January 1 falls on a different day from one year to the next.