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Calendar reform

Index Calendar reform

Calendar reform, properly calendrical reform, is any significant revision of a calendar system. [1]

86 relations: AD 1, Anno Lucis, Auguste Comte, Bahá'í calendar, Bahá'í Faith, Buddhist calendar, Calendar, Calendar date, Chinese calendar, Common year, Constantinople, December solstice, Decimal calendar, Determination of the day of the week, Eastern Orthodox Church, Epoch (reference date), Federal government of the United States, Fiscal year, French Republican Calendar, Greek alphabet, Gregorian calendar, Hanke–Henry Permanent Calendar, Hebrew calendar, Hindu calendar, Holocene calendar, Hugh Jones (professor), Humours of an Election, Intercalation (timekeeping), International Fixed Calendar, Invariable Calendar, Isaac Asimov, Islamic calendar, ISO 8601, ISO basic Latin alphabet, ISO week date, Jalali calendar, Japanese era name, Johannes de Sacrobosco, José Argüelles, Julian calendar, Julius Caesar, Knuckle mnemonic, League of Nations, Leap week calendar, Leap year, List of calendars, Lunar calendar, Lunar phase, Lunisolar calendar, March equinox, ..., Mars (mythology), Meton of Athens, Metric time, Milutin Milanković, Mnemonic, Molad, Month, Napoleon, Omar Khayyam, Opus Majus, Pax Calendar, Perennial calendar, Playing card, Pope Gregory XIII, Positivist calendar, Revised Julian calendar, Roger Bacon, Roman calendar, Sabbath, Seljuk Empire, Sidereal year, Stonehenge, Suit (cards), Symmetry454, Synod, Thirty Days Hath September, Thor, Tranquility Calendar, Tropical year, Week, Workweek and weekend, World Calendar, World Council of Churches, World War II, Year zero, 1 BC. Expand index (36 more) »

AD 1

AD 1 (I), 1 AD or 1 CE is the epoch year for the Anno Domini calendar era.

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Anno Lucis

Anno Lucis (“in the Year of Light”) is a dating system used in Masonic ceremonial or commemorative proceedings, which is equivalent to the Gregorian year plus 4000.

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Auguste Comte

Isidore Marie Auguste François Xavier Comte (19 January 1798 – 5 September 1857) was a French philosopher who founded the discipline of praxeology and the doctrine of positivism.

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Bahá'í calendar

The Bahá'í calendar, also called the Badíʿ calendar (Badíʿ means wondrous or unique), is a solar calendar with years composed of 19 months of 19 days each (361 days) plus an extra period of "Intercalary Days".

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Bahá'í Faith

The Bahá'í Faith (بهائی) is a religion teaching the essential worth of all religions, and the unity and equality of all people.

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Buddhist calendar

The Buddhist calendar is a set of lunisolar calendars primarily used in mainland Southeast Asian countries of Cambodia, Laos, Myanmar and Thailand as well as in Sri Lanka and Chinese populations of Malaysia and Singapore for religious or official occasions.

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A calendar is a system of organizing days for social, religious, commercial or administrative purposes.

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Calendar date

A calendar date is a reference to a particular day represented within a calendar system.

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Chinese calendar

The traditional Chinese calendar (official Chinese name: Rural Calendar, alternately Former Calendar, Traditional Calendar, or Lunar Calendar) is a lunisolar calendar which reckons years, months and days according to astronomical phenomena.

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Common year

A common year is a calendar year with 365 days.

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Constantinople (Κωνσταντινούπολις Konstantinoúpolis; Constantinopolis) was the capital city of the Roman/Byzantine Empire (330–1204 and 1261–1453), and also of the brief Latin (1204–1261), and the later Ottoman (1453–1923) empires.

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December solstice

The December solstice, also known as the southern solstice, is the solstice that occurs each December, typically between the 20th and the 22nd day of the month according to the Gregorian calendar.

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Decimal calendar

A decimal calendar is a calendar which includes units of time based on the decimal system.

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Determination of the day of the week

The determination of the day of the week for any date may be performed with a variety of algorithms.

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Eastern Orthodox Church

The Eastern Orthodox Church, also known as the Orthodox Church, or officially as the Orthodox Catholic Church, is the second-largest Christian Church, with over 250 million members.

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Epoch (reference date)

In the fields of chronology and periodization, an epoch is an instant in time chosen as the origin of a particular era.

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Federal government of the United States

The federal government of the United States (U.S. federal government) is the national government of the United States, a constitutional republic in North America, composed of 50 states, one district, Washington, D.C. (the nation's capital), and several territories.

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Fiscal year

A fiscal year (or financial year, or sometimes budget year) is the period used by governments for accounting and budget purposes, which vary between countries.

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French Republican Calendar

The French Republican Calendar (calendrier républicain français), also commonly called the French Revolutionary Calendar (calendrier révolutionnaire français), was a calendar created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and for 18 days by the Paris Commune in 1871.

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Greek alphabet

The Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BC.

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Gregorian calendar

The Gregorian calendar is the most widely used civil calendar in the world.

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Hanke–Henry Permanent Calendar

The Hanke–Henry Permanent Calendar (HHPC) is a proposal for calendar reform.

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Hebrew calendar

The Hebrew or Jewish calendar (Ha-Luah ha-Ivri) is a lunisolar calendar used today predominantly for Jewish religious observances.

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Hindu calendar

Hindu calendar is a collective term for the various lunisolar calendars traditionally used in India.

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Holocene calendar

The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant (AD or CE) numbering scheme, placing its first year near the beginning of the Holocene geological epoch and the Neolithic Revolution, when humans transitioned from a hunter-gatherer lifestyle to agriculture and fixed settlements.

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Hugh Jones (professor)

The Reverend Hugh Jones (1691–1760) is the most famous and accomplished of a sometimes confusing array of Anglican clergymen of the same name from the American colonies of Virginia and Maryland.

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Humours of an Election

The Humours of an Election is a series of four oil paintings and later engravings by William Hogarth that illustrate the election of a member of parliament in Oxfordshire in 1754.

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Intercalation (timekeeping)

Intercalation or embolism in timekeeping is the insertion of a leap day, week, or month into some calendar years to make the calendar follow the seasons or moon phases.

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International Fixed Calendar

The International Fixed Calendar (also known as the Cotsworth plan, the Eastman plan, the 13 Month calendar or the Equal Month calendar) is a solar calendar proposal for calendar reform designed by Moses B. Cotsworth, who presented it in 1902.

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Invariable Calendar

In April 1900, Professor L. A. Grosclaude of Geneva proposed the Invariable Calendar, New Era Calendar, or Normal Calendar with 12 months and four 91-day quarters of exactly 13 weeks.

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Isaac Asimov

Isaac Asimov (January 2, 1920 – April 6, 1992) was an American writer and professor of biochemistry at Boston University.

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Islamic calendar

The Islamic, Muslim, or Hijri calendar (التقويم الهجري at-taqwīm al-hijrī) is a lunar calendar consisting of 12 months in a year of 354 or 355 days.

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ISO 8601

ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date- and time-related data.

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ISO basic Latin alphabet

The ISO basic Latin alphabet is a Latin-script alphabet and consists of two sets of 26 letters, codified in various national and international standards and used widely in international communication.

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ISO week date

The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2004) and, before that, it was defined in ISO (R) 2015 since 1971.

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Jalali calendar

The Jalali calendar is a solar calendar that was used in Iran (Persia), variants of which today are still in use in Iran as well as Afghanistan.

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Japanese era name

The, also known as, is the first of the two elements that identify years in the Japanese era calendar scheme.

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Johannes de Sacrobosco

Johannes de Sacrobosco, also written Ioannis de Sacro Bosco (1195 – 1256), was a scholar, monk and astronomer who was a teacher at the University of Paris.

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José Argüelles

José Argüelles, born Joseph Anthony Arguelles (January 24, 1939 – March 23, 2011), was an American New Age author and artist.

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Julian calendar

The Julian calendar, proposed by Julius Caesar in 46 BC (708 AUC), was a reform of the Roman calendar.

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Julius Caesar

Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC), known by his cognomen Julius Caesar, was a Roman politician and military general who played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire.

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Knuckle mnemonic

The knuckle mnemonic is a mnemonic device for remembering the number of days in the months of the Julian and Gregorian calendars.

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League of Nations

The League of Nations (abbreviated as LN in English, La Société des Nations abbreviated as SDN or SdN in French) was an intergovernmental organisation founded on 10 January 1920 as a result of the Paris Peace Conference that ended the First World War.

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Leap week calendar

A leap week calendar is a calendar system with a whole number of weeks every year, and with every year starting on the same weekday.

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Leap year

A leap year (also known as an intercalary year or bissextile year) is a calendar year containing one additional day (or, in the case of lunisolar calendars, a month) added to keep the calendar year synchronized with the astronomical or seasonal year.

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List of calendars

This is a list of calendars.

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Lunar calendar

A lunar calendar is a calendar based upon the monthly cycles of the Moon's phases (synodic months), in contrast to solar calendars, whose annual cycles are based only directly upon the solar year.

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Lunar phase

The lunar phase or phase of the Moon is the shape of the directly sunlit portion of the Moon as viewed from Earth.

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Lunisolar calendar

A lunisolar calendar is a calendar in many cultures whose date indicates both the moon phase and the time of the solar year.

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March equinox

The March equinox or Northward equinox is the equinox on the Earth when the subsolar point appears to leave the southern hemisphere and cross the celestial equator, heading northward as seen from Earth.

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Mars (mythology)

In ancient Roman religion and myth, Mars (Mārs) was the god of war and also an agricultural guardian, a combination characteristic of early Rome.

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Meton of Athens

Meton of Athens (Μέτων ὁ Ἀθηναῖος; gen.: Μέτωνος) was a Greek mathematician, astronomer, geometer, and engineer who lived in Athens in the 5th century BC.

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Metric time

Metric time is the measure of time interval using the metric system, which defines the second as the base unit of time, and multiple and submultiple units formed with metric prefixes, such as kiloseconds and milliseconds.

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Milutin Milanković

Milutin Milanković (Милутин Миланковић, pronounced; 28 May 1879 – 12 December 1958) was a Serbian mathematician, astronomer, climatologist, geophysicist, civil engineer and popularizer of science.

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A mnemonic (the first "m" is silent) device, or memory device, is any learning technique that aids information retention or retrieval (remembering) in the human memory.

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Molad (מולד, plural Moladot, מולדות) is a Hebrew word meaning "birth" that also generically refers to the time at which the New Moon is "born".

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A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates.

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Napoléon Bonaparte (15 August 1769 – 5 May 1821) was a French statesman and military leader who rose to prominence during the French Revolution and led several successful campaigns during the French Revolutionary Wars.

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Omar Khayyam

Omar Khayyam (عمر خیّام; 18 May 1048 – 4 December 1131) was a Persian mathematician, astronomer, and poet.

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Opus Majus

The Opus Majus (Latin for "Greater Work") is the most important work of Roger Bacon.

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Pax Calendar

The Pax calendar was invented by James A. Colligan, SJ in 1930 as a perennializing reform of the annualized Gregorian calendar.

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Perennial calendar

A perennial calendar is a calendar that applies to any year, keeping the same dates, weekdays and other features.

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Playing card

A playing card is a piece of specially prepared heavy paper, thin cardboard, plastic-coated paper, cotton-paper blend, or thin plastic, marked with distinguishing motifs and used as one of a set for playing card games.

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Pope Gregory XIII

Pope Gregory XIII (Gregorius XIII; 7 January 1502 – 10 April 1585), born Ugo Boncompagni, was Pope of the Catholic Church from 13 May 1572 to his death in 1585.

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Positivist calendar

The positivist calendar was a calendar reform proposal by Auguste Comte in 1849.

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Revised Julian calendar

The Revised Julian calendar, also known as the Milanković calendar, or, less formally, new calendar, is a calendar proposed by the Serbian scientist Milutin Milanković in 1923, which effectively discontinued the 340 years of divergence between the naming of dates sanctioned by those Eastern Orthodox churches adopting it and the Gregorian calendar that has come to predominate worldwide.

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Roger Bacon

Roger Bacon (Rogerus or Rogerius Baconus, Baconis, also Rogerus), also known by the scholastic accolade Doctor, was an English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empiricism.

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Roman calendar

The Roman calendar was the calendar used by the Roman kingdom and republic.

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Sabbath is a day set aside for rest and worship.

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Seljuk Empire

The Seljuk Empire (also spelled Seljuq) (آل سلجوق) was a medieval Turko-Persian Sunni Muslim empire, originating from the Qiniq branch of Oghuz Turks.

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Sidereal year

A sidereal year (from Latin sidus "asterism, star") is the time taken by the Earth to orbit the Sun once with respect to the fixed stars.

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Stonehenge is a prehistoric monument in Wiltshire, England, west of Amesbury.

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Suit (cards)

No description.

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The Symmetry454 Calendar (Sym454) is a proposal for calendar reform created by Dr.

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A synod is a council of a church, usually convened to decide an issue of doctrine, administration or application.

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Thirty Days Hath September

"Thirty Days Hath September..." or "Thirty Days Has September..." is a traditional verse mnemonic used to remember the number of days in the months of the Julian and Gregorian calendars.

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In Norse mythology, Thor (from Þórr) is the hammer-wielding god of thunder, lightning, storms, oak trees, strength, the protection of mankind, in addition to hallowing, and fertility.

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Tranquility Calendar

The Tranquility Calendar is a solar calendar proposal for calendar reform proposed by Jeff Siggins in 1989.

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Tropical year

A tropical year (also known as a solar year) is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice.

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A week is a time unit equal to seven days.

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Workweek and weekend

The workweek and weekend are those complementary parts of the week devoted to labour and rest, respectively.

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World Calendar

The World Calendar is a proposed reform of the Gregorian calendar created by Elisabeth Achelis of Brooklyn, New York in 1930.

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World Council of Churches

The World Council of Churches (WCC) is a worldwide inter-church organization founded in 1948.

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World War II

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.

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Year zero

Year zero does not exist in the Anno Domini system usually used to number years in the Gregorian calendar and in its predecessor, the Julian calendar.

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1 BC

Year 1 BC was a common year starting on Friday or Saturday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Thursday of the Proleptic Julian calendar.

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Redirects here:

13-month calendar, Blank day, Calendar Reform, Calendar, Reform of the, Calendrical reform, Reform of the Calendar, Uniform calendar.


[1] https://en.wikipedia.org/wiki/Calendar_reform

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