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The Bonavian Calendar By Chris Carrier The common year of the calendar consists of 364 days, which are divided into
four quarters of 91 days each. The first month in each quarter consists of 35
days, and the next two months of 28 days each. Months and weeks always begin
on the same day of the week. Every month in the
Five times in 28 years, specifically in years which, after division by 28, leave remainders of 0, 5, 11, 16, or 22, a leap week is added. This addition of 35 days every 28 years brings the average length of the year to 365.25 days. In years which are divisible by 896, however, leap week is cancelled. This reduces the average year length to 365+(31/128) days, a value an order of magnitude more accurate than the Gregorian calendar's 365.2425. Leap-week calendars on the Bonavian model are a reasonable compromise between those who wish to preserve the seven-day week, which the Bonavian Calendar does, and those who wish a simple calendar in which each month and quarter can be easily memorized. There are now three versions of the Bonavian Calendar; the first is the
A name for the calendar wasn't settled on until about 1975. I had given it a number of names, "Leap Week Calendar" and "Arcturian Calendar" (after Arcturus, prominent right after sunset in the North Temperate Zone at Original Bonavian New Year) but eventually I decided to name it the "Bonavian Calendar" after my high school, St. Bonaventure H.S. in Ventura, California. My second calendar is named the In addition, leap week was moved from mid-August to the last week of the year in December, as it makes computing the number of days between dates easier if the intercalary days are at the end of the year, as they are in the Islamic, Persian, French Republican, both of the Egyptian, and several other calendars. The third, In years divisible by 28, a thirteenth month of 35 days duration is added, named Mercedonius, which, since we are still using Roman names, is logical because that was the 13th month name the Romans were using when they still had leap months pre-Caesar. The 35 day leap month is shortened to 28 days in years divisible by 896 to fix the average year length at 365+(31/128) days. |
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