Proposal

Summary of the calendar proposal

The Equal Quarters Calendar is non-perpetual solar calendar proposal with equal quarters and 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. And each quarter is divided into three months of 30, 30, and 31 days respectively. They are identical, except for the extra days added to the last month. The year have 12 months.
  • In common years, at the end of the last month, day 365th is added, called 32th.
  • In leap years, day 366th also called 32 is added, resulting in a double day.
  • Within the year, the quarters are identical except for day 32th of last month.
  • The week has seven days.
  • The enumeration of the years is carried out according to the Human Era or Holocene Era system.

Description of Equal Quarters Calendar

Equal Quarters Calendar es a solar calendar, that is, its mayor cycle is the year, which approximately corresponds to the rotation of the Earth around the Sun. The year is subdivided into quarters, months, and days. In parallel, the seven-day week cycle is carried out.

In this calendar 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 successive years the arrangement of the dates on the days of the week changes. Therefore, commemorations, holidays, and birthdays, vary their position in the week over the years.

The Equal Quarters Calendar has a seven-day week. In the weekly cycle the days are designated D1, D2, D3, D4, D5, D6, and D7, where D1 corresponds to Monday of the Gregorian calendar.

The year is divided into four quarters of 91 days each. In turn, each quarter is divided into three months of 30, 30, and 31 days respectively. The day 365th is added to the end of the last month of the fourth quarter, and is called 32th. In leap years, the day 366th is added after the 365th, and is also named 32th. Resulting in a double day. The months are designated M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, and M12.

In this calendar are corresponding months:

  • M1, M4, M7, and M10.
  • M2, M5, M8, and M11.
  • M3, M6, M9, and M12.

In the same year, the quarters are identical except for the 32th days of the last quarter. The four quarters start on the same day of the week, that is, they are corresponding quarters. Therefore, the arrangement of dates on the days of the week is identical in the four quarters of the year. This is where the name Equal Quarters comes from.

Thanks to this symmetry, the Equal Quarters calendar can be represented annually, and quarterly, also called reduced form.

The Equal Quarters  year 12020 is a leap year, an extra double day 32 is added at the end of the last month.
The Equal Quarters year 12020 is a leap year, an extra double day 32 is added at the end of the last month.
The Equal Quarters year 12021 is a common year. An extra day 32 is added to the end of the last month.
The Equal Quarters year 12021 is a common year. An extra day 32 is added to the end of the last month.

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. The year 1 corresponds to the year 10000 B.C. of Gregorian calendar.

It cannot be specified exactly when the Holocene geological era began, nor when should be considered the beginning of human civilization, 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.

Conversion examples
Anno Domini ConversiĆ³n 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.
2021 B.C.
2021 B.C. 10001-2021 7980 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.
2021 A.D.
2021 A.D. 10000+2021 12021 H.E.

Advantages of Equal Quarters Calendar

  • 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 simply 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. To call 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 month 12.
  • It is easy to know what day of the week will be a date.
  • It can be represented annually and quarterly.
  • In the Human Era system, every year is positive, which provides a better historical perspective and continuity.
  • Equal Quarters calendar is independent of religions and ideologies.

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