The Alpo Balognia Calendar A is a calendar invented by Tim Forsythe in which the year is divided into four seasons rather than 12 months.
The year is divided into four seasons: Spring, Summer, Autumn, and Winter, beginning with Spring (northern hemisphere) and each season has 91 days divided into 13 weeks of 7 days each. Each season begins on a Monday. The four seasons are followed by a feast period of 1 to 5 days, which does not belong to any week.
|1 stage||= 5 years|
|1 generation||= 5 stages||= 25 years|
|1 collapse||= 18 generations||= 450 years|
|1 cycle||= 20 collapses||= 9000 years|
The Feast days at the end of the year are used to periodically realign the calendar with the seasons. Each year has its one feast day plus a second feast day if its the last year of a stage, plus a third feast day if its the last year of a generation, plus fourth feast day if its the last year of a collapse, plus a fifth feast day if its the last year of a 9000-year cycle.
This gives a mean year of 365 + 1/5 + 1/25 + 1/450 + 1/9000 days = 365 + 2181/9000 = 365.242333333 days.
The five Feast days are named as follows: The Feast of the Dead (Ar), The Feast of the Mother (Om), The Feast of the Earth (Po), The Feast of the Father (Og), and The Feast of the Living (Ri). The days of the week are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday.
The current cycle is named The Alpobalognian Cycle and began on the equivalent of 22 March 4727 B.C.E. of the Gregorian Calendar. It will end on the equivalent of 20 March 4274 of the Gregorian Calendar.
The standard notation for enumerating dates is as follows (where the current cycle and collapse are normally omitted and assumed):
- [[Weekday,] SeasonDay Season]] [[cycle.]collapse.]generation.stage.year[.day]
|0.20.18.5.5.369||the last day of the previous cycle|
|18.104.22.168.1.1||the first day the the current cycle|
|22.214.171.124.369||the last day of the current cycle|
|126.96.36.199.1.1||the first day the the next cycle|
|The Feast of the Father 188.8.131.52||the last day of previous collapse|
|1 Spring 184.108.40.206||the first day of the current collapse|
|Tuesday, 16 Winter 18.2.4||January 1, 2008 (Gregorian)|
|Om 18.2.5||17 March 2009 (Gregorian)|
|18.2.5||the year starting on 18 March 2008 and ending on 18 March 2009 (Gregorian)|
The calendar is perpetual so that the following chart can be used for each season.
A mock history of Calendar A can be found in the external links along with a calendar converter that will convert between Gregorian and Calendar A calendars.