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Leap year

Index 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. [1]

106 relations: Adar, Ahmadiyya, Ancient Rome, Anno Domini, Anthony, Texas, Astronomical year numbering, Ayyám-i-Há, Bahá'í calendar, Bede, Bengali calendars, Birthday, Brady Haran, Brigid of Kildare, Buddhist calendar, Calendar reform, Calendar year, Cambodia, Catholic Church, Censorinus, Century leap year, Cheshvan, Chinese calendar, Christian Ludwig Ideler, Christmas, Comic opera, Computus, Coordinated Universal Time, Coptic calendar, Decemviri, Decretales Gregorii IX, Divisor, Diwali, Easter, Equinox, Ethiopian calendar, February 29, Full moon, Gale, Gilbert and Sullivan, Gregorian calendar, Hajj, Hebrew alphabet, Hebrew calendar, Hegira, Hindu calendar, Indian national calendar, Intercalation (timekeeping), Islamic calendar, Jewish holidays, Julian calendar, ..., Julius Caesar, Kislev, La Bougie du Sapeur, Laos, Leap second, Leap week calendar, Leap year bug, Lunar phase, Lunisolar calendar, Macrobius, March equinox, Margaret, Maid of Norway, Marriage proposal, Mercedonius, Metonic cycle, Myanmar, Names of the days of the week, National Geographic Society, Natural number, Nepal, Passover, Petticoat, Pope Alexander III, Proleptic Gregorian calendar, Pseudocode, Revised Julian calendar, Roman calendar, Saint Matthias, Saint Patrick, Sansculottides, Seasonal year, Shabbat, Solar calendar, Solstice, South India, Sri Lanka, Summer Olympic Games, Syzygy (astronomy), Tabular Islamic calendar, Taiwan, Tamil Nadu, Tehran, Terminus (god), Thai lunar calendar, Thai solar calendar, The Pirates of Penzance, Torah, Tradition, Tropical year, UEFA European Championship, United States Naval Observatory, Vigil, Vikram Samvat, Year, Yom Kippur, Zeller's congruence. Expand index (56 more) »

Adar

Adar (אֲדָר; from Akkadian adaru) is the sixth month of the civil year and the twelfth month of the ecclesiastical year on the Hebrew calendar, roughly corresponding to the month of March in the Gregorian calendar.

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Ahmadiyya

Ahmadiyya (officially, the Ahmadiyya Muslim Community or the Ahmadiyya Muslim Jama'at; الجماعة الإسلامية الأحمدية, transliterated: al-Jamā'ah al-Islāmiyyah al-Aḥmadiyyah; احمدیہ مسلم جماعت) is an Islamic religious movement founded in Punjab, British India, in the late 19th century.

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Ancient Rome

In historiography, ancient Rome is Roman civilization from the founding of the city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD, encompassing the Roman Kingdom, Roman Republic and Roman Empire until the fall of the western empire.

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Anno Domini

The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars.

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Anthony, Texas

Anthony is an incorporated town in El Paso County, Texas, United States.

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Astronomical year numbering

Astronomical year numbering is based on AD/CE year numbering, but follows normal decimal integer numbering more strictly.

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Ayyám-i-Há

Ayyám-i-Há refers to a period of intercalary days in the Bahá'í calendar, when Bahá'ís celebrate the Festival of Ayyám-i-Há.

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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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Bede

Bede (italic; 672/3 – 26 May 735), also known as Saint Bede, Venerable Bede, and Bede the Venerable (Bēda Venerābilis), was an English Benedictine monk at the monastery of St.

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Bengali calendars

The Bengali Calendar or Bangla Calendar (Baṅgābda) is a solar calendar used in the region of Bengal.

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Birthday

A birthday is the anniversary of the birth of a person, or figuratively of an institution.

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Brady Haran

Brady John Haran (born 18 June 1976) is an Australian-born British independent filmmaker and video journalist who is known for his educational videos and documentary films produced for BBC News and his YouTube channels, the most notable being Periodic Videos and Numberphile.

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Brigid of Kildare

Saint Brigid of Kildare or Brigid of Ireland (Naomh Bríd; Brigida; 525) is one of Ireland's patron saints, along with Patrick and Columba.

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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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Calendar reform

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

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Calendar year

Generally speaking, a calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days.

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Cambodia

Cambodia (កម្ពុជា, or Kampuchea:, Cambodge), officially known as the Kingdom of Cambodia (ព្រះរាជាណាចក្រកម្ពុជា, prĕəh riəciənaacak kampuciə,; Royaume du Cambodge), is a sovereign state located in the southern portion of the Indochina peninsula in Southeast Asia.

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Catholic Church

The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with more than 1.299 billion members worldwide.

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Censorinus

Censorinus was a Roman grammarian and miscellaneous writer from the 3rd century AD.

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Century leap year

In the Gregorian calendar, a year ending in "00" that is divisible by 400 is a century leap year, with the intercalation of February 29 yielding 366 days instead of 365.

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Cheshvan

Marcheshvan (מַרְחֶשְׁוָן, Standard Marḥešvan Tiberian Marḥešwān; from Akkadian waraḫsamnu, literally, "eighth month"), sometimes shortened to Cheshvan (Standard Ḥešvan Tiberian Ḥešwān), is the second month of the civil year (which starts on 1 Tishrei), and the eighth month of the ecclesiastical year (which starts on 1 Nisan) on the Hebrew calendar.

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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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Christian Ludwig Ideler

Christian Ludwig Ideler (21 September 1766 – 10 August 1846) was a German chronologist and astronomer.

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Christmas

Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.

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Comic opera

Comic opera denotes a sung dramatic work of a light or comic nature, usually with a happy ending.

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Computus

Computus (Latin for "computation") is a calculation that determines the calendar date of Easter.

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Coordinated Universal Time

No description.

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Coptic calendar

The Coptic calendar, also called the Alexandrian calendar, is a liturgical calendar that was used by the Coptic Orthodox Church and is still used in Egypt.

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Decemviri

The decemviri or decemvirs (Latin for "ten men") were any of several 10-man commissions established by the Roman Republic.

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Decretales Gregorii IX

The Decretals of Gregory IX (Latin, Decretales Gregorii IX), also collectively called the Liber extra, are an important source of medieval Canon Law.

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Divisor

In mathematics, a divisor of an integer n, also called a factor of n, is an integer m that may be multiplied by some integer to produce n. In this case, one also says that n is a multiple of m. An integer n is divisible by another integer m if m is a divisor of n; this implies dividing n by m leaves no remainder.

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Diwali

Diwali or Deepavali is the Hindu festival of lights celebrated every year in autumn in the northern hemisphere (spring in southern hemisphere).

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Easter

Easter,Traditional names for the feast in English are "Easter Day", as in the Book of Common Prayer, "Easter Sunday", used by James Ussher and Samuel Pepys and plain "Easter", as in books printed in,, also called Pascha (Greek, Latin) or Resurrection Sunday, is a festival and holiday celebrating the resurrection of Jesus from the dead, described in the New Testament as having occurred on the third day of his burial after his crucifixion by the Romans at Calvary 30 AD.

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Equinox

An equinox is commonly regarded as the moment the plane (extended indefinitely in all directions) of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 22-23 September.

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Ethiopian calendar

The Ethiopian calendar (የኢትዮጵያ ዘመን አቆጣጠር; yä'Ityoṗṗya zämän aḳoṭaṭär) is the principal calendar used in Ethiopia and also serves as the liturgical year for Christians in Eritrea and Ethiopia belonging to the Eritrean Orthodox Tewahedo Church, Ethiopian Orthodox Tewahedo Church, Eastern Catholic Churches and Coptic Orthodox Church of Alexandria.

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February 29

February 29, also known as leap day or leap year day, is a date added to most years that are divisible by 4, such as 2008, 2012, 2016, 2020, and 2024.

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Full moon

The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective.

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Gale

A gale is a strong wind, typically used as a descriptor in nautical contexts.

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Gilbert and Sullivan

Gilbert and Sullivan refers to the Victorian-era theatrical partnership of the dramatist W. S. Gilbert (1836–1911) and the composer Arthur Sullivan (1842–1900) and to the works they jointly created.

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Gregorian calendar

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

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Hajj

The Hajj (حَجّ "pilgrimage") is an annual Islamic pilgrimage to Mecca, the holiest city for Muslims, and a mandatory religious duty for Muslims that must be carried out at least once in their lifetime by all adult Muslims who are physically and financially capable of undertaking the journey, and can support their family during their absence.

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Hebrew alphabet

The Hebrew alphabet (אָלֶף־בֵּית עִבְרִי), known variously by scholars as the Jewish script, square script and block script, is an abjad script used in the writing of the Hebrew language, also adapted as an alphabet script in the writing of other Jewish languages, most notably in Yiddish (lit. "Jewish" for Judeo-German), Djudío (lit. "Jewish" for Judeo-Spanish), and Judeo-Arabic.

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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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Hegira

The Hegira (also called Hijrah, هِجْرَة) is the migration or journey of the Islamic prophet Muhammad and his followers from Mecca to Yathrib, later renamed by him to Medina, in the year 622.

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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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Indian national calendar

The Indian national calendar, sometimes called the Shalivahana Shaka calendar, is used along with the Vikram Samvat calendar.

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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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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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Jewish holidays

Jewish holidays, also known as Jewish festivals or Yamim Tovim ("Good Days", or singular Yom Tov, in transliterated Hebrew), are holidays observed in Judaism and by JewsThis article focuses on practices of mainstream Rabbinic Judaism.

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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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Kislev

Kislev (Hebrew: כִּסְלֵו, Standard Kislev Tiberian Kislēw; also Chislev) is the third month of the civil year and the ninth month of the ecclesiastical year on the Hebrew calendar.

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La Bougie du Sapeur

La Bougie du Sapeur is a humorous French newspaper launched in 1980 that prints only on Leap Day, making it the world’s least frequently published newspaper.

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Laos

Laos (ລາວ,, Lāo; Laos), officially the Lao People's Democratic Republic (Lao: ສາທາລະນະລັດ ປະຊາທິປະໄຕ ປະຊາຊົນລາວ, Sathalanalat Paxathipatai Paxaxon Lao; République démocratique populaire lao), commonly referred to by its colloquial name of Muang Lao (Lao: ເມືອງລາວ, Muang Lao), is a landlocked country in the heart of the Indochinese peninsula of Mainland Southeast Asia, bordered by Myanmar (Burma) and China to the northwest, Vietnam to the east, Cambodia to the southwest and Thailand to the west and southwest.

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Leap second

A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time as realized by UT1.

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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 bug

The leap year bug (also known as the leap year problem) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from the wrong calculation of which years are leap years.

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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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Macrobius

Macrobius, fully Macrobius Ambrosius Theodosius, also known as Theodosius, was a Roman provincial who lived during the early fifth century, at the transition of the Roman to the Byzantine Empire, and when Latin was as widespread as Greek among the elite.

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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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Margaret, Maid of Norway

Margaret, Maid of Norway (9 April 1283 – 26 September 1290) was a Norwegian princess who was recognised as Queen of Scots following the death of her grandfather, King Alexander III, in March 1286.

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Marriage proposal

A marriage proposal is an event where one person in a relationship asks for the other's hand in marriage.

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Mercedonius

Mercedonius or Mercedinus (Latin for "Work Month"),.

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Metonic cycle

For astronomy and calendar studies, the Metonic cycle or Enneadecaeteris (from ἐννεακαιδεκαετηρίς, "nineteen years") is a period of very close to 19 years that is nearly a common multiple of the solar year and the synodic (lunar) month.

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Myanmar

Myanmar, officially the Republic of the Union of Myanmar and also known as Burma, is a sovereign state in Southeast Asia.

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Names of the days of the week

The names of the days of the week in many languages are derived from the names of the classical planets in Hellenistic astrology, which were in turn named after contemporary deities, a system introduced by the Roman Empire during Late Antiquity.

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National Geographic Society

The National Geographic Society (NGS), headquartered in Washington, D.C., United States, is one of the largest non-profit scientific and educational institutions in the world.

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Natural number

In mathematics, the natural numbers are those used for counting (as in "there are six coins on the table") and ordering (as in "this is the third largest city in the country").

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Nepal

Nepal (नेपाल), officially the Federal Democratic Republic of Nepal (सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल), is a landlocked country in South Asia located mainly in the Himalayas but also includes parts of the Indo-Gangetic Plain.

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Passover

Passover or Pesach (from Hebrew Pesah, Pesakh) is a major, biblically derived Jewish holiday.

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Petticoat

A petticoat or underskirt is an article of clothing, a type of undergarment worn under a skirt or a dress.

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Pope Alexander III

Pope Alexander III (c. 1100/1105 – 30 August 1181), born Roland of Siena, was Pope from 7 September 1159 to his death in 1181.

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Proleptic Gregorian calendar

The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to dates preceding its official introduction in 1582.

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Pseudocode

Pseudocode is an informal high-level description of the operating principle of a computer program or other algorithm.

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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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Roman calendar

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

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Saint Matthias

Matthias (Hebrew transliteration: Mattityahu; Koine Greek: Μαθθίας; ⲙⲁⲑⲓⲁⲥ; died c. 80 AD) was, according to the Acts of the Apostles, the apostle chosen to replace Judas Iscariot following Judas' betrayal of Jesus and his subsequent death.

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Saint Patrick

Saint Patrick (Patricius; Pádraig; Padrig) was a fifth-century Romano-British Christian missionary and bishop in Ireland.

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Sansculottides

The Sansculottides (also Epagomènes; French Sans-culottides, Sanculottides, jours complémentaires, jours épagomènes) are holidays following the last month of the year on the French Republican Calendar which was used following the French Revolution from approximately 1793 to 1805.

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Seasonal year

The seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, or the flowering of a species of plant.

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Shabbat

Shabbat (שַׁבָּת, "rest" or "cessation") or Shabbos (Ashkenazi Hebrew and שבת), or the Sabbath is Judaism's day of rest and seventh day of the week, on which religious Jews, Samaritans and certain Christians (such as Seventh-day Adventists, the 7th Day movement and Seventh Day Baptists) remember the Biblical creation of the heavens and the earth in six days and the Exodus of the Hebrews, and look forward to a future Messianic Age.

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Solar calendar

A solar calendar is a calendar whose dates indicate the season or almost equivalently the position of the apparent position of the sun in relative to the stars.

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Solstice

A solstice is an event occurring when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere.

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South India

South India is the area encompassing the Indian states of Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and Telangana as well as the union territories of Lakshadweep, Andaman and Nicobar Islands and Puducherry, occupying 19% of India's area.

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Sri Lanka

Sri Lanka (Sinhala: ශ්‍රී ලංකා; Tamil: இலங்கை Ilaṅkai), officially the Democratic Socialist Republic of Sri Lanka, is an island country in South Asia, located in the Indian Ocean to the southwest of the Bay of Bengal and to the southeast of the Arabian Sea.

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Summer Olympic Games

The Summer Olympic Games (Jeux olympiques d'été) or the Games of the Olympiad, first held in 1896, is an international multi-sport event that is hosted by a different city every four years.

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Syzygy (astronomy)

In astronomy, a syzygy (from the Ancient Greek σύζυγος suzugos meaning, "yoked together") is a (usually) straight-line configuration of three or more celestial bodies in a gravitational system.

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Tabular Islamic calendar

The Tabular Islamic calendar (an example is the Fatimid or Misri calendar) is a rule-based variation of the Islamic calendar.

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Taiwan

Taiwan, officially the Republic of China (ROC), is a state in East Asia.

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Tamil Nadu

Tamil Nadu (• tamiḻ nāḍu ? literally 'The Land of Tamils' or 'Tamil Country') is one of the 29 states of India.

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Tehran

Tehran (تهران) is the capital of Iran and Tehran Province.

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Terminus (god)

In Roman religion, Terminus was the god who protected boundary markers; his name was the Latin word for such a marker.

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Thai lunar calendar

The Thai lunar calendar (ปฏิทินจันทรคติ,,, literally, Specific days according to lunar norms), or Tai calendar, is a lunisolar Buddhist calendar.

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Thai solar calendar

The Thai solar calendar (ปฏิทินสุริยคติ,, "solar calendar") was adopted by King Chulalongkorn (Rama V) in AD 1888 as the Siamese version of the Gregorian calendar, replacing the Thai lunar calendar as the legal calendar in Thailand (though the latter is still also used, especially for traditional and religious events).

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The Pirates of Penzance

The Pirates of Penzance; or, The Slave of Duty is a comic opera in two acts, with music by Arthur Sullivan and libretto by W. S. Gilbert.

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Torah

Torah (תּוֹרָה, "Instruction", "Teaching" or "Law") has a range of meanings.

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Tradition

A tradition is a belief or behavior passed down within a group or society with symbolic meaning or special significance with origins in the past.

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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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UEFA European Championship

The UEFA European Championship (known informally as the Euros) is the primary association football competition contested by the senior men's national teams of the members of the Union of European Football Associations (UEFA), determining the continental champion of Europe.

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United States Naval Observatory

The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation and Timing (PNT) for the United States Navy and the United States Department of Defense.

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Vigil

A vigil, from the Latin vigilia meaning wakefulness (Greek: pannychis, παννυχίς or agrypnia ἀγρυπνία), is a period of purposeful sleeplessness, an occasion for devotional watching, or an observance.

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Vikram Samvat

Vikram Samvat (विक्रम सम्वत्, विक्रम सम्वत्) (abbreviated as V.S. (or VS) or B.S. (or BS))) (also called the Bikrami calendar or sometimes just Hindu calendar) is the historical Hindu calendar of India and Nepal. It uses lunar months and solar sidereal years. It is used as the official calendar in Nepal.

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Year

A year is the orbital period of the Earth moving in its orbit around the Sun.

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Yom Kippur

Yom Kippur (יוֹם כִּיפּוּר,, or), also known as the Day of Atonement, is the holiest day of the year in Judaism.

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Zeller's congruence

Zeller's congruence is an algorithm devised by Christian Zeller to calculate the day of the week for any Julian or Gregorian calendar date.

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Bisextile, Bisextile day, Bisextile year, Bissextile, Bissextile day, Bissextile year, Byteluys, Intercalary year, Leap cycle, Leap rule, Leap years, Leapling, Leapyear, List of leap years, Skottdagen, Skottår.

References

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

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