In a year with Dominical Letter A, all days marked A are Sundays. Let us first assume that you are only interested in which dates fall on which days of the week; you are not interested in the dates for Easter and other irregular holidays. So please feel free to celebrate the start of a century any day you like!
But this turned out to be difficult to handle, because equinox is not completely simple to predict.
In fact, the first decree implementing the calendar () contained two contradictory rules, as it stated that: In practice, the first calendars were based on the equinoxial condition.
It works in this manner: Assign the letter A to 1 January, B to 2 Jan, C to 3 Jan, ... The earliest uses of BC dating are found in the works of the Venerable Bede (673-735). Let us propose a few compromises: Any 100-year period is a century.
G to 7 Jan, A to 8 Jan, B to 9 Jan, and so on, using the letters A to G and omitting the leap day. Therefore the period from 23 June 2004 to 22 June 2104 is a century.
This rule gives 218 leap years every 900 years, which gives us an average year of 365 218/900 days = 365.24222 days, which is certainly more accurate than the official Gregorian number of 365.2425 days. This affects countries such as Sweden and Austria that celebrate "name days" (i.e., each day is associated with a name).
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In the Julian calendar the relationship between the days of the week and the dates of the year is repeated in cycles of 28 years.For example, the calendars for the years 19 are identical, even when it comes to the date for Easter. Some cultures eschew year counts altogether but name each year after an event that characterized the year.But sometimes a very long time can pass before a calendar can be reused; if you happen to have a calendar from 1940, you won’t be able to reuse it until the year 5280! To most people it is ; to an American it is ; and to a person using the international standard it could be (although a year specified with only two digits does not conform to the ISO standard). However, a count of years from an initial epoch is the most successful way of maintaining a consistent chronology.The calendar used throughout the world today is the Gregorian calendar.It is sometimes called a "Christian" calendar, and additional historic information about this calendar, and its precursor, the Julian calendar, are available in the history of the Cristian calendar section.But if you also want your calendar’s indication of Easter and other Christian holidays to be correct, the rules are far too complex to be put to a simple formula. The calendars described in this exhibit, except for the Chinese calendar, have counts of years from initial epochs.Sometimes calendars can be reused after just six years. In the case of the Chinese calendar and some calendars not included here, years are counted in cycles, with no particular cycle specified as the first cycle.The Internatinal Organization for Standardization, ISO, has published a standard on how to write dates, times, and time intervals. The text below refers to the third edition of that standard, which was published on 1 December 2004.Its title is: ISO 8604, "Data elements and interchange formats - Information interchange - Representation of dates and times." Leap years were introduced to keep New Year’s Day on autumnal equinox.With these restrictions, the answer is as follows: Note that the expression X 28 occurs in all four items above. Similarly, the 21st century started in 2001, but the 2000s started in 2000. Years after the birth of Christ are traditionally identified using the Latin abbreviation AD ("Anno Domini", that is, "In the Year of the Lord").So you can always reuse your calendar every 28 years. Years before the birth of Christ are in English traditionally identified using the abbreviation B. Some people, who want to avoid the reference to Christ that is implied in these terms, prefer the abbreviations BCE ("Before the Common Era" or "Before the Christian Era") and CE ("Common Era" or "Christian Era").