The fixed quarter is a calendar proposal. It is a non-perpetual solar calendar with seven-day week.
- It is a non-perpetual solar calendar.
- The year begins approximately with the spring equinox in the northern hemisphere, and the autumn equinox in the southern hemisphere.
- The year is divided into four quarters of 91 days each.
- Each quarter is divided into three months of 30, 30, and 31 days respectively.
- At the end of the last month of the last quarter, day 365th, called 32, is added.
- In leap years, day 366th is also added, likewise called 32. It is a double day.
- Within the year, the quarters are identical except for day 32th, which can be single or double, added to the last month of the last quarter, and therefore is the last day of the year.
- The seven-day week cycle is preserved.
- The enumeration of the years is carried out according to the Human Era or Holocene Era system.
The major cycle of the Fixed Quarters calendar is the year, which is subdivided into quarters, months, and days. In parallel, the seven-day week cycle is preserved.
Fixed Quarters is a solar calendar, that is, its major cycle corresponds approximately to the rotation of the Earth around the Sun.
In this proposal, the year begins approximately with the spring equinox in the northern hemisphere, and the autumn equinox in the southern hemisphere.
It is a non-perpetual calendar, that is, the day of the week in which year begins varies each year. This implies in subsequent years the arrangement of the dates on the days of the week will remain rotating. Therefore, commemorations, holidays, and birthdays vary their position in the week with the passing of the years.
In the Fixed Quarters calendar, the week of seven days is conserved. The days of the week are listed from 1 to 7 until now called D1 … D7, where D1 corresponds to Monday of the current denomination.
The year is divided into four quarters of 91 days each. Each quarter is divided into three months of 30, 30, and 31 days respectively. Day 365th is added at the end of the last month of the fourth quarter, is named 32th. In leap years, day 366th is added after 365th, it is also named 32th. It is a double day.
In the same year, the quarters are identical except for the 32th days of the last quarter. The quarters have 91 days. Since 91 is a multiple of 7, in the year, the four quarters begin on the same day of the week, that is, are corresponding quarters. Therefore, the arrangement of dates on the days of the week is identical in the four quarters of the same year. From this comes the name Fixed Quarters.
Also due to the above, in this proposal, the corresponding months are identical except for the addition of the 32th days in the last month.
Thanks to this symmetry, the Fixed Quarters calendar can be represented annually and quarterly.
The months are listed from 1 to 12 until now called M1 … M12.
In this calendar are corresponding months:
- M1, M4, M7, and M10.
- M2, M5, M8, and M11.
- M3, M6, M9, and M12.
The enumeration of the years is carried out according to the Human Era or Holocene Era system, created by Cesare Emiliani in 1993. Its name is derived from the Holocene geological era. Year 1 corresponds to year 10000 B.C. of the Gregorian calendar.
It cannot be specified exactly when the Holocene geological era began, nor when the beginning of human civilization should be considered, but this period, of just over 12,000 years, includes all recorded human history.
The conversion is made by adding 10 000 to the Gregorian year if it is A.D. and subtracting the Gregorian year from 10 001 if it is A.C.
|Anno Domini||Conversión||Era Humana|
|H.E. Year Zero
||10001 B.C.||10001-10001||0 H.E.|
|H.E. Year One||10000 B.C.||10001-10000||1 H.E.|
||2012 B.C.||10001-2012||7989 H.E.|
|Last year B.C.||1 B.C.||10001-1||10000 H.E.|
|First year A.D.||1 A.D.||10000+1||10001 H.E.|
||2012 A.D.||10000+2012||12012 H.E.|
The fixed quarter year 12014 is a common year, so only one extra day is added at the end of the fourth quarter.
The fixed quarter year 12016 is a leap year, an extra double day is added at the end of the fourth quarter.
- Months length is regular and easy to memorize: 30, 30, 31, 30, 30, 31, 30, 30, 31, 30, 30, and 32. Or simply 30, 30, and 31 (+1).
- Quarters length is regular: 91, 91, 91, and 92. Or 91 (+1).
- The seven-day week cycle is preserved.
- The displacement of the dates on the day of the week is preserved. But by adding the extra day at the end of the year the double displacement of the dates on the days of the week will be the same for all the days of the following year.
- There is no leap day date. Calling 32th to both extra days removes the date of the leap day and therefore the problem of those people born on the leap day. In common years, the 32th day is simple, and in leap years it is a double day named by a single date, the 32th of the month 12. People born at any time of this double day will be registered on the 32th of the 12th month.
- It is easy to know what day of the week a date will be.
- It can be represented in two forms: annual and quarterly.
- In the Human Era system, every year is positive, which provides a better historical perspective and continuity.
- The Fixed Quarters calendar is independent of religions and ideologies.