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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.

## Leap cycle

 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.

## Date notation

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]

Some examples:

 0.20.18.5.5.369 the last day of the previous cycle 1.1.1.1.1.1 the first day the the current cycle 20.18.5.5.369 the last day of the current cycle 2.1.1.1.1.1 the first day the the next cycle The Feast of the Father 14.18.5.5 the last day of previous collapse 1 Spring 15.1.1.1 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.

Quarter layout
Week 1 2 3 4 5 6 7
Mon Tue Wed Thu Fri Sat Sun
W01 01 02 03 04 05 06 07
W02 08 09 10 11 12 13 14
W03 15 16 17 18 19 20 21
W04 22 23 24 25 26 27 28
W05 29 30 31 32 33 34 35
W06 36 37 38 39 40 41 42
W07 43 44 45 46 47 48 49
W08 50 51 52 53 54 55 56
W09 57 58 59 60 61 62 63
W10 64 65 66 67 68 69 70
W11 71 72 73 74 75 76 77
W12 78 79 80 81 82 83 84
W13 85 86 87 88 89 90 91

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.

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