theAbysmal Calendar ~ the perpetual 52~Week Year

Organizing the calendar into regular measure.

theAbysmal Calendar’s annual component organizes the 365 Days of the Year into a perpetual structure that remains the same from one Year to the Next, while allowing the greatest number of time periods possible. In order to keep the Calendar Year aligned with the Tropical Year, a Leap Year Day is inserted periodically.

There are 6 components to consider with theAbysmal Perpetual Calendar:

  1. the period of the Leap Year
  2. the 52~Week Year
  3. the 28~Fortnight Year
  4. the Wheel of the Year
  5. the Market Week
  6. the Zodiac

theAbysmal Leap Year

The Leap Year Day (LYD) is added once every 4 Years, with an exception every 128 Years, when the LYD is not added. This most closely aligns the Calendar Year with the Tropical Year.

Calendar Year: = 365.242 187 5 = 365 + 1/4 – 1/128

Tropical Year = 365.242 189 7

LYD is inserted after the last Day of one Year and the first Day of the next to avoid disrupting the Year’s perpetual structure.

theAbysmal 52~Week Year

Commonly referred to as a 13-Month Calendar, theAbysmal Calendar divides the Year into 52 Weeks. These aren’t the Saturday through Friday weekdays, simply unnamed periods of 7 days. The weekdays are an ancient time-measure, and there has consistently been vocal opposition to disrupting them. So, we won’t.

52 weeks adds up to 364 Weekdays. The remaining day is New Year Day (NYD) which falls outside of the 52 weeks/13 months of the year. It comes after the last day of one Year and before the first day of the next. When the Leap Year Day is inserted, it falls outside of the weeks/months as well. It falls after the last day of one Year and the New Year Day.

Each 52~Week Year can be organized into 13 Months of 4 Weeks each (28 Days), as well as 4 Quarters of 13 Weeks each (91 Days).

Years are numbered 0 to infinity, Quarters are numbered 0 to 3, Months are numbered 0 to 12, Weeks are numbered 0 to 51.

The Days of the Year are numbered 0 to 363, the Days of the Quarter 0 to 90, and the Days of the Month 0 to 27.

Year 0: December 22nd to December 20th
Quarter 0: December 22nd to March 22nd
Month 0: December 22nd to January 4th
Week 0: December 22nd to December 28th

theAbysmal 28~Fortnight Year

theAbysmal Calendar also divides the Year into 13~Day “Fortnights” [nb this name is temporary] as well as the NYD and LYD. These periods run concurrently with the Weeks.

Each 28~Fortnight Year can be organized into 7 “Houses” of 4 Fortnights each (52 Days), as well as 4 Quarters of 7 Fortnights each (91 Days).

Years are numbered 0 to infinity, Quarters are numbered 0 to 3, Houses are numbered 0 to 6, Fortnights are numbered 0 to 27.

The Days of the Year are numbered 0 to 363, the Days of the Quarter 0 to 90, the Days of the House are numbered 0 to 51, and the Days of the Fortnight 0 to 12.

Year 0: December 22nd to December 20th
Quarter 0: December 22nd to March 22nd
House 0: December 22nd to February 11th
Fortnight 0: December 22nd to January 3rd

theAbysmal Wheel of the Year and mid~Quarter Days

Each Quarter of the Perpetual Year is set to begin on or about the Solstices and Equinoxes, and lasts 91 Days. There are 4 mid-Quarter Day that fall 45 Days after the beginning and 45 Days before the end of each Quarter.

Mid~Quarter 0: February 5th
Mid~Quarter 1: May 7th
Mid~Quarter 2: August 6th
Mid~Quarter 3: November 5th

The mid~Quarter Days provide the means to divide the Wheel of the Year into 8 segments.


wheel of the year - weekdayless

Market Weeks

Market Weeks are periods of time of any number of days used to schedule work-rest periods,  market days and locations, or religious events. Throughout the world, different lengths of market weeks have been used for centuries, however, the 7~Day week has supplanted a growing number of them.

In order to accommodate the greatest number of market weeks, theAbysmal Calendar uses 360 Days to do so, given it has a large number of factors. Practically speaking, Market Weeks are no greater than 20 Day in length.

The 360 Days of the Perpetual Market Week Calendar exclude the NYD, LYD, and the 4 mid~Quarter Days. 

This provides us with the following 12 Market Weeks:

2~Day Market Week x 180
3~Day Market Week x 120
4~Day Market Week x  90
5~Day Market Week x  72
6~Day Market Week x  60
8~Day Market Week x  45
9~Day Market Week x  40
10~Day Market Week x 36
12~Day Market Week x 30
15~Day Market Week x 24
18~Day Market Week x 20
20~Day Market Week x 18

Market Week Days are numbered from 0 to 1, 2, 3, 4, 5, 7, 8, 9, 11, 14, 17, or 19.

If we consider the 7~Day13~Day, and  14~Day Market Weeks from the 364~Day Year, that gives us a total of 15 different time periods with which to work. If we were to extend this up to quarter-, third-, and half-year periods, our year would have this rhythm to it:



If we were able to see the background stars, we would see the Sun pass in front of each of the Constellations of the Zodiac during the following times (according to the International Astronomical Union). Due to the Precession of the Equinoxes, these dates will fall 1 Day earlier every 71 Years or so. For the time being, these dates will remain fixed throughout theAbysmal Perpetual Year.

NOTE: realizing that these particular constellations, even though they are defined by the International Astronomer’s Union, have a heavy western bias to them, this isn’t an explicit part of the theAbysmal Calendar. What I was hoping to establish was a connection between the motion of the stars during the year and over the precession. Many cultures (south and southeast asian particularly) celebrate the new year on or around the 18th of April to celebrate the event. The starting point, as arbitrary as it is, is more important than the subdivisions within. This particular aspect of the calendar is less likely to be important going forward, however, it’s an interesting addition and bears further expansion into other traditions.

Aries: April 18th to May 12th
Taurus: May 13th to June 20th
Gemini: June 21st to July 19th
Cancer: July 20th to August 9th
Leo: August 10th to September 15th
Virgo: September 16th to October 29th
Libra: October 30th to November 22nd
Scorpio: November 23rd to November 28th
Ophiuchus: November 29th to December 16th
Sagittarius: December 17th to January 19th
Capricorn: January 20th to February 15th
Aquarius: February 16th to March 10th
Pisces:    March 11th to April 17th

theAbysmal Calendar
Perpetual 13-Month Calendar
Lunisolar Calendar
Calendar Symbolism

Chromatic Counter

Historical Eras

Astronomical Facts
Abbreviations & Notation
Arguments for Calendar Reform
theAbysmal Calendar for Download

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