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Dominical Letter
Dominical letters or Sunday letters are a method used to determine the day of the week for particular dates. When using this method, each year is assigned a letter (or pair of letters for leap years) depending on which day of the week the year starts with. The Dominical letter for the current year 2025 is E. Dominical letters are derived from the Roman practice of marking the repeating sequence of eight letters A–H (commencing with A on January 1) on stone calendars to indicate each day's position in the eight-day market week ('' nundinae''). The word is derived from the number nine due to their practice of inclusive counting. After the introduction of Christianity a similar sequence of seven letters A–G was added alongside, again commencing with January 1. The dominical letter marks the Sundays. Nowadays they are used primarily as part of the computus, which is the method of calculating the date of Easter. A common year is assigned a single dominical letter, indicating which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Day Of The Week
In a vast number of languages, the names given to the seven days of the week are derived from the names of the classical planets in Hellenistic astronomy, which were in turn named after contemporary deities, a system introduced by the Sumerians and later adopted by the Babylonians from whom the Roman Empire adopted the system during late antiquity. In some other languages, the days are named after corresponding deities of the regional culture, beginning either with Sunday or with Monday. The seven-day week was adopted in early Christianity from the Hebrew calendar, and gradually replaced the Roman internundinum. Sunday remained the first day of the week, being considered the day of the sun god Sol Invictus and the Lord's Day, while the Jewish Sabbath remained the seventh. The Babylonians invented the actual seven-day week in 600 BCE, with Emperor Constantine making the Day of the Sun (, "Sunday") a legal holiday centuries later. In the international standard ISO 86 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Year Starting On Sunday
A common year starting on Sunday is any non-leap year (i.e. a year with 365 days) that begins on Sunday, January 1, 1 January, and ends on Sunday, December 31, 31 December. Its dominical letter hence is A. The most recent year of such kind was 2023, and the next one will be 2034 in the Gregorian calendar, or, likewise, 2018 and 2029 in the obsolete Julian calendar, see #Applicable years, below for more. Any common year that starts on a Sunday has two Friday the 13ths: those two in this common year January 13, occur in January and October 13, October. This year has four months (January, April, July and October) which begin on a weekend-day. Calendars Applicable years Gregorian Calendar In the (currently used) Gregorian calendar, alongside Common year starting on Monday, Monday, Common year starting on Wednesday, Wednesday, Common year starting on Friday, Friday or Common year starting on Saturday, Saturday, the fourteen types of year (seven common, seven leap) repeat in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Monday
A leap year starting on Monday is any year with 366 days (i.e. it includes February 29, 29 February) that begins on Monday, 1 January, and ends on Leap year starting on Tuesday, Tuesday, 31 December. Its dominical letters hence are GF. The most recent year of such kind was 2024, and the next one will be 2052 in the Gregorian calendar or, likewise, 2008 and 2036 in the obsolete Julian calendar. Any leap year that starts on Monday has two Friday the 13ths: those two in this leap year September 13, occur in September and December 13, December. Common year starting on Tuesday, Common years starting on Tuesday share this characteristic. This year has three months (June, September and December) which begin on a weekend-day. Calendars Applicable years Gregorian Calendar Leap years that begin on Monday, along with those Leap year starting on Saturday, starting on Saturday and Leap year starting on Thursday, Thursday, occur least frequently: 13 out of 97 (≈ 13.4%) total leap y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Tuesday
A leap year starting on Tuesday is any year with 366 days (i.e. it includes 29 February) that begins on Tuesday, 1 January, and ends on Wednesday, 31 December. Its dominical letters hence are FE. The most recent year of such kind was 2008, and the next one will be 2036 in the Gregorian calendar or, likewise 2020 and 2048 in the obsolete Julian calendar. Any leap year that starts on Tuesday has only one Friday the 13th; the only one in this leap year occurs in June. Common years starting on Wednesday (such as 2025) share this characteristic. Any leap year that starts on Tuesday has only one Tuesday the 13th: the only one in this leap year occurs in May. Any leap year that starts on Tuesday has only one Friday the 17th: the only one in this leap year occurs in October. From August of the common year preceding that year until October in this type of year is also the longest period (14 months) that occurs without a Friday the 17th. This year has three months (March, June ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Wednesday
A leap year starting on Wednesday is any year with 366 days (i.e. it includes 29 February) that begins on Wednesday 1 January and ends on Thursday 31 December. Its dominical letters hence are ED. The most recent year of such kind was 2020, and the next one will be 2048 in the Gregorian calendar, or likewise, 2004 and 2032 in the obsolete Julian calendar, see below for more. Any leap year that starts on Wednesday has two Friday the 13ths: those two in this leap year occur in March and November. Common years starting on Thursday share this characteristic, but also have another in February. Leap years starting on Sunday also share a similar characteristic to this type of leap year, three Friday the 13th's have a three month gap between them, the former two being in the common year preceding this type of leap year, those being September and December, and the latter being in this type of year, that being March. Leap years starting on Sunday share this by having January, April ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Thursday
A leap year starting on Thursday is any year with 366 days (i.e. it includes 29 February) that begins on Thursday 1 January, and ends on Friday 31 December. Its dominical letters hence are DC. The most recent year of such kind was 2004, and the next one will be 2032 in the Gregorian calendar or, likewise, 2016 and 2044 in the obsolete Julian calendar. This is the only leap year with three occurrences of Tuesday the 13th: those three in this leap year occur three months (13 weeks) apart: in January, April, and July. Common years starting on Monday share this characteristic, in the months of February, March, and November. Any leap year that starts on Thursday has two Friday the 13ths: those two in this leap year occur in February and August. This is also the only year in which February has five Sundays, as the leap day adds that extra Sunday. This year has three months (February, May and August) which begin on a weekend-day. Calendars Applicable years Gregor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Friday
A leap year starting on Friday is any year with 366 days (i.e. it includes 29 February) that begins on Friday 1 January and ends on Saturday 31 December. Its dominical letters hence are CB. The most recent year of such kind was 2016, and the next one will be 2044 in the Gregorian calendar or, likewise, 2000 and 2028 in the obsolete Julian calendar. Any leap year that starts on Friday has only one Friday the 13th: the only one in this leap year occurs in May. Common years starting on Saturday share this characteristic. This is also the only year in which February has five Mondays, as the leap day adds that extra Monday. This year has two months (May and October) which begin on a weekend-day. Since at least one month begins on each day of the week in all years, this is the fewest possible number of months to begin on a weekend-day in a given year; this also occurs in a common year starting on Friday, in which case the two months are May and August. Calendars Applic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Saturday
A leap year starting on Saturday is any year with 366 days (i.e. it includes 29 February) that begins on Saturday, 1 January, and ends on Sunday, 31 December. Its dominical letters hence are BA. The most recent year of such kind was 2000, and the next one will be 2028 in the Gregorian calendar or, likewise 2012 and 2040 in the obsolete Julian calendar. In the Gregorian calendar, years divisible by 400 are always leap years starting on Saturday. The most recent such occurrence was 2000 and the next one will be 2400, see below for more. Any leap year that starts on Saturday has only one Friday the 13th: the only one in this leap year occurs in October. Common years starting on Sunday share this characteristic, but also have another in January. From August of the common year preceding that year until October in this type of year is also the longest period (14 months) that occurs without a Friday the 13th. Common years starting on Tuesday share this characteristic, from July ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leap Year Starting On Sunday
A leap year starting on Sunday is any year with 366 days (i.e. it includes 29 February) that begins on Sunday, 1 January, and ends on Monday, 31 December. Its dominical letters hence are AG. The most recent year of such kind was 2012, and the next one will be 2040 in the Gregorian calendar or, likewise 2024 and 2052 in the obsolete Julian calendar. This is the only leap year with three occurrences of Friday the 13th: those three in this leap year occur three months (13 weeks) apart: January 13, in January, April 13, April, and July 13, July. Common year starting on Thursday, Common years starting on Thursday share this characteristic, in the months of February, March, and November. Additionally, these types of years are the only ones which contain 54 different calendar weeks (2 partial, 52 in full) in areas of the world where Monday is considered the first day of the week. This year has five months (January, April, July, September and December) which begin on a weekend-day. This i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Year Starting On Monday
A common year starting on Monday is any non-leap year (i.e., a year with 365 days) that begins on Monday, 1 January, and ends on Monday, 31 December. Its dominical letter hence is G. The most recent year of such kind was 2018, and the next one will be 2029 in the Gregorian calendar, or likewise, 2019 and 2030 in the Julian calendar, see below for more. This common year is one of the three possible common years in which a century year can begin on and occurs in century years that yield a remainder of 300 when divided by 400. The most recent such year was 1900, and the next one will be 2300. Any common year that starts on Monday has two Friday the 13ths: those two in this common year occur in April and July. From July of the year in this type of year to September in the year that follows this type of year is the longest period that occurs without a Friday the 13th, unless the following year is a leap year starting on Tuesday, in which case the gap only 11 months, as the next ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Year Starting On Tuesday
A common year starting on Tuesday is any non-leap year (i.e. a year with 365 days) that begins on Tuesday, 1 January, and ends on Tuesday, 31 December. Its dominical letter hence is F. The most recent year of such kind was 2019, and the next one will be 2030, or, likewise, 2025 and 2031 in the obsolete Julian calendar, see #Applicable years, below for more. Any common year that starts on Tuesday has two Friday the 13ths: those two in this common year September 13, occur in September and December 13, December. Leap year starting on Monday, Leap years starting on Monday share this characteristic. From July of the year preceding this year until September in this type of year is the longest period (14 months) that occurs without a Friday the 13th. leap year starting on Saturday, Leap years starting on Saturday share this characteristic, from August of the common year starting on Friday, common year that precedes it to October in that type of year. This year has three months (June, Sept ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Year Starting On Wednesday
A common year starting on Wednesday is any non-leap year (a year with 365 days) that begins on Wednesday, January 1, and ends on Wednesday, December 31. Its dominical letter hence is E. The current year, 2025, is a common year starting on Wednesday in the Gregorian calendar, and the next such year will be 2031, or, likewise, 2015 and 2026 in the obsolete Julian calendar, see below for more. This common year is one of the three possible common years in which a century year can begin on, and occurs in century years that yield a remainder of 200 when divided by 400. The most recent such year was 1800, and the next one will be 2200. Any common year that starts on Wednesday has only one Friday the 13th: the only one in this common year occurs in June. Leap years starting on Tuesday share this characteristic. This year has four months (February, March, June and November) which begin on a weekend-day. Calendars Applicable years Gregorian Calendar In the (currently ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
