The 13-month Sol Calendar is a proposal for calendar reform by Jim Eikner of Austin, Texas, USA, providing for a year of 13 months in length, with 12 contiguous months having 28 days each, with the final month of the year, December, having 29. December would have 30 days in leap years. The months are named the same as they are in the Gregorian calendar, except that a month called Sol is inserted between June and July.
* * December 29.
* † In leap years December 30 is added. The next leap year beginning on Sunday would be 2012. The 13 months occur on the following Gregorian dates:
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| - The 13-month Sol Calendar is a proposal for calendar reform by Jim Eikner of Austin, Texas, USA, providing for a year of 13 months in length, with 12 contiguous months having 28 days each, with the final month of the year, December, having 29. December would have 30 days in leap years. The months are named the same as they are in the Gregorian calendar, except that a month called Sol is inserted between June and July.
* * December 29.
* † In leap years December 30 is added. The next leap year beginning on Sunday would be 2012. The 13 months occur on the following Gregorian dates:
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- 31(xsd:integer)
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- 2012(xsd:integer)
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- 1(xsd:integer)
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- 30(xsd:integer)
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| abstract
| - The 13-month Sol Calendar is a proposal for calendar reform by Jim Eikner of Austin, Texas, USA, providing for a year of 13 months in length, with 12 contiguous months having 28 days each, with the final month of the year, December, having 29. December would have 30 days in leap years. The months are named the same as they are in the Gregorian calendar, except that a month called Sol is inserted between June and July. Although every month of the same year begins on the same day of week, the months usually begin on different days of the week in different years. The calendar for every month in the year 2007 (and every other year that begins on a Monday) is as follows:
* * December 29.
* † In leap years December 30 is added. The next leap year beginning on Sunday would be 2012. In 2007 all months would begin on Monday, in 2008 all month would begin on Tuesday, in 2009 all months would begin on Thursday. The 13 months occur on the following Gregorian dates: * These dates are a day earlier in a leap year The 13-month Sol Calendar is an adaptation of International Fixed Calendar, which has its roots in the Positivist Calendar created by French philosopher August Comte in 1849. Comte named months for famous people and also named each day, but Eikner’s calendar does not follow that example. Eikner’s proposal also differs from these other 13-month calendars in that it is not perpetual. In each year, the 29th and 30th days of December move the first day of the January of the following year either one or two weekdays forward in relation to that previous year. However, in any given year, monthly calendars for January through November are identical. The Positivist and International Fixed Calendars suggest adding "intercalary" days between months or at the end of the year, in order to have each month begin on the same day - year after year. Because these "off-calendar" days are not counted as part of any month or week, they are said to disrupt the ordering of the traditional seven-day week in relation to weekdays. This has led these calendar proposals to face opposition by religious groups who are required to worship on a certain weekday, and also worship every seven days.
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