86 relations: Albanian Orthodox Church, Anno Domini, Annunciation, Apostles' Fast, Astronomy, Autocephaly, Bright Week, Bulgarian Orthodox Church, Calendar, Celestial equator, Christendom, Christmas, Church of Cyprus, Church of Greece, Church of the Holy Sepulchre, Computus, Declination, Easter, Eastern Orthodox Church, Ecumenical council, Ecumenical Patriarch of Constantinople, Ecumenical Patriarchate of Constantinople, Edward Reingold, Finnish Orthodox Church, First Council of Nicaea, Floating-point arithmetic, Floor and ceiling functions, Forty Martyrs of Sebaste, Fred Espenak, Freemasonry, Full moon, Georgian Orthodox Church, Great Lent, Greece, Greek Old Calendarists, Greek Orthodox Church of Antioch, Greek Orthodox Church of Jerusalem, Greek Orthodox Patriarchate of Alexandria and all Africa, Gregorian calendar, ΔT, Jean Meeus, Jerusalem, Julian calendar, Julian day, Kingdom of Yugoslavia, Leap year, List of heads of the Serbian Orthodox Church, Liturgical year, Living Church, Macedonian Orthodox Church – Ohrid Archbishopric, ..., March equinox, Meletius IV of Constantinople, Milutin Milanković, Modular arithmetic, Modulo operation, Mount Athos, Nachum Dershowitz, Nativity of Jesus, New calendarists, New Year, Nicaea, Numerical integration, Paschal cycle, Patriarch Tikhon of Moscow, Pentarchy, Polish Orthodox Church, Pope Gregory XIII, Proleptic calendar, Quotient, Rata Die, Remainder, Romanian Orthodox Church, Russian Orthodox Church, Scatter plot, Schism, Serbian Orthodox Church, Solar time, Southern Hemisphere, Soviet Union, Terrestrial Time, Tidal acceleration, Tropical year, Universal Time, Westernization, Winter solstice, Year zero. Expand index (36 more) » « Shrink index
The Autocephalous Orthodox Church of Albania (Kisha Ortodokse Autoqefale e Shqipërisë) is one of the newest autocephalous Eastern Orthodox Churches.
The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars.
The Annunciation (from Latin annuntiatio), also referred to as the Annunciation to the Blessed Virgin Mary, the Annunciation of Our Lady, or the Annunciation of the Lord, is the Christian celebration of the announcement by the angel Gabriel to the Virgin Mary that she would conceive and become the mother of Jesus, the Son of God, marking his Incarnation.
The Apostles Fast, also called the Fast of the Holy Apostles, the Fast of Peter and Paul, or sometimes St.
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
Autocephaly (from αὐτοκεφαλία, meaning "property of being self-headed") is the status of a hierarchical Christian Church whose head bishop does not report to any higher-ranking bishop (used especially in Eastern Orthodox, Oriental Orthodox and Independent Catholic churches).
Bright Week, Pascha Week or Renewal Week (Διακαινήσιμος Ἑβδομάς) is the name used by the Eastern Orthodox and Byzantine Rite Catholic Churches for the period of seven days beginning on Easter and continuing up to (but not including) the following Sunday, which is known as Thomas Sunday.
The Bulgarian Orthodox Church (Българска православна църква, Balgarska pravoslavna tsarkva) is an autocephalous Orthodox Church.
A calendar is a system of organizing days for social, religious, commercial or administrative purposes.
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
Christendom has several meanings.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Church of Cyprus (Ἐκκλησία τῆς Κύπρου) is one of the autocephalous Churches that together form the communion of the Eastern Orthodox Church.
The Church of Greece (Ἐκκλησία τῆς Ἑλλάδος, Ekklisía tis Elládos), part of the wider Greek Orthodox Church, is one of the autocephalous churches which make up the communion of Orthodox Christianity.
The Church of the Holy Sepulchre (كَنِيسَةُ ٱلْقِيَامَة Kanīsatu al-Qiyāmah; Ναὸς τῆς Ἀναστάσεως Naos tes Anastaseos; Սուրբ Հարության տաճար Surb Harut'yan tač̣ar; Ecclesia Sancti Sepulchri; כנסיית הקבר, Knesiyat ha-Kever; also called the Church of the Resurrection or Church of the Anastasis by Orthodox Christians) is a church in the Christian Quarter of the Old City of Jerusalem.
Computus (Latin for "computation") is a calculation that determines the calendar date of Easter.
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
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.
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.
An ecumenical council (or oecumenical council; also general council) is a conference of ecclesiastical dignitaries and theological experts convened to discuss and settle matters of Church doctrine and practice in which those entitled to vote are convoked from the whole world (oikoumene) and which secures the approbation of the whole Church.
The Ecumenical Patriarch (Η Αυτού Θειοτάτη Παναγιότης, ο Αρχιεπίσκοπος Κωνσταντινουπόλεως, Νέας Ρώμης και Οικουμενικός Πατριάρχης, "His Most Divine All-Holiness the Archbishop of Constantinople, New Rome, and Ecumenical Patriarch") is the Archbishop of Constantinople–New Rome and ranks as primus inter pares (first among equals) among the heads of the several autocephalous churches that make up the Eastern Orthodox Church.
The Ecumenical Patriarchate of Constantinople (Οἰκουμενικόν Πατριαρχεῖον Κωνσταντινουπόλεως, Oikoumenikón Patriarkhíon Konstantinoupóleos,; Patriarchatus Oecumenicus Constantinopolitanus; Rum Ortodoks Patrikhanesi, "Roman Orthodox Patriarchate") is one of the fourteen autocephalous churches (or "jurisdictions") that together compose the Eastern Orthodox Church.
Edward M. Reingold (born 1945) is a computer scientist active in the fields of algorithms, data structures, graph drawing, and calendrical calculations.
The Finnish Orthodox Church (Suomen ortodoksinen kirkko; Finska Ortodoxa Kyrkan), or Orthodox Church of Finland, is an autonomous Eastern Orthodox archdiocese of the Ecumenical Patriarchate of Constantinople.
The First Council of Nicaea (Νίκαια) was a council of Christian bishops convened in the Bithynian city of Nicaea (now İznik, Bursa province, Turkey) by the Roman Emperor Constantine I in AD 325.
In computing, floating-point arithmetic is arithmetic using formulaic representation of real numbers as an approximation so as to support a trade-off between range and precision.
In mathematics and computer science, the floor function is the function that takes as input a real number x and gives as output the greatest integer less than or equal to x, denoted \operatorname(x).
The Forty Martyrs of Sebaste or the Holy Forty (Ancient/Katharevousa Greek Ἃγιοι Τεσσεράκοντα; Demotic: Άγιοι Σαράντα) were a group of Roman soldiers in the Legio XII ''Fulminata'' (Armed with Lightning) whose martyrdom in 320 for the Christian faith is recounted in traditional martyrologies.
Fred Espenak (born 1953) is a retired emeritus American astrophysicist.
Freemasonry or Masonry consists of fraternal organisations that trace their origins to the local fraternities of stonemasons, which from the end of the fourteenth century regulated the qualifications of stonemasons and their interaction with authorities and clients.
The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective.
The Georgian Apostolic Autocephalous Orthodox Church (საქართველოს სამოციქულო ავტოკეფალური მართლმადიდებელი ეკლესია, sakartvelos samotsikulo avt’ok’epaluri martlmadidebeli ek’lesia) is an autocephalous Eastern Orthodox Church in full communion with the other churches of Eastern Orthodoxy.
Great Lent, or the Great Fast, (Greek: Μεγάλη Τεσσαρακοστή or Μεγάλη Νηστεία, meaning "Great 40 Days," and "Great Fast," respectively) is the most important fasting season in the church year in the Byzantine Rite of the Eastern Orthodox Church (including Western Rite Orthodoxy) and the Eastern Catholic Churches, which prepares Christians for the greatest feast of the church year, Pascha (Easter).
Greek Old Calendarists (Greek: Παλαιοημερολογίτες, Paleoimerologites), sometimes abbreviated as GOC ("Genuine Orthodox Christians"), are groups of Old Calendarist Orthodox Christians that remained committed to the traditional Orthodox practice and are not in communion with many other Orthodox churches such as the Orthodox Church of Greece, the Patriarchate of Constantinople, or the Church of Cyprus.
The Greek Orthodox Church of Antioch, also known as the Antiochian Orthodox Church (Πατριαρχεῖον Ἀντιοχείας, Patriarcheîon Antiocheías; بطريركية أنطاكية وسائر المشرق للروم الأرثوذكس, Baṭriyarkiyya Anṭākiya wa-Sāʾir al-Mashriq li'l-Rūm al-Urthūdhuks), is an autocephalous Greek Orthodox Church within the wider communion of Eastern Orthodox Christianity.
The Eastern Orthodox Patriarchate of Jerusalem (Πατριαρχεῖον Ἱεροσολύμων, Patriarcheîon Hierosolýmōn) or Greek Orthodox Patriarchate of Jerusalem (كنيسة الروم الأرثوذكس في القدس Kanisatt Ar-rum al-Urtudoks fi al-Quds, literally Rûm/Roman Orthodox Church of Jerusalem), and officially called simply the Patriarchate of Jerusalem, is an autocephalous Church within the wider communion of Eastern Orthodox Christianity.
The Greek Orthodox Patriarchate of Alexandria and all Africa (Greek: Πατριαρχεῖον Ἀλεξανδρείας καὶ πάσης Ἀφρικῆς, Patriarcheîon Alexandreías kaì pásēs Aphrikês) is an autocephalous Byzantine Rite jurisdiction of the Eastern Orthodox Church, having the African continent as its canonical territory.
The Gregorian calendar is the most widely used civil calendar in the world.
In precise timekeeping, ΔT (Delta T, delta-T, deltaT, or DT) is the time difference obtained by subtracting Universal Time (UT) from Terrestrial Time (TT):.
Jean Meeus (born 12 December 1928) is a Belgian meteorologist and amateur astronomer specializing in celestial mechanics, spherical and mathematical astronomy.
Jerusalem (יְרוּשָׁלַיִם; القُدس) is a city in the Middle East, located on a plateau in the Judaean Mountains between the Mediterranean and the Dead Sea.
The Julian calendar, proposed by Julius Caesar in 46 BC (708 AUC), was a reform of the Roman calendar.
Julian day is the continuous count of days since the beginning of the Julian Period and is used primarily by astronomers.
The Kingdom of Yugoslavia (Serbo-Croatian, Slovene: Kraljevina Jugoslavija, Краљевина Југославија; Кралство Југославија) was a state in Southeast Europe and Central Europe, that existed from 1918 until 1941, during the interwar period and beginning of World War II.
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.
This article lists the heads of the Serbian Orthodox Church, since the establishment of the church as an autocephalous Archbishopric in 1219 to today's Patriarchate.
The liturgical year, also known as the church year or Christian year, as well as the kalendar, consists of the cycle of liturgical seasons in Christian churches that determines when feast days, including celebrations of saints, are to be observed, and which portions of Scripture are to be read either in an annual cycle or in a cycle of several years.
The Living Church (Живая Церковь), also called Renovationist Church (обновленческая церковь) or Renovationism (обновленчество; from обновление ‘renovation, renewal’; official name Orthodox Russian Church, Православная Российская Церковь, later Orthodox Church in USSR, Православная Церковь в СССР) was a schism in the Russian Orthodox Church in 1922–1946.
The Macedonian Orthodox Church – Ohrid Archbishopric (MOC-OA; Македонска православна црква – Охридска архиепископија (МПЦ-ОА), tr. Makedonska pravoslavna crkva – Ohridska arhiepiskopija (MPC-OA)), or simply the Macedonian Orthodox Church (MOC; Македонска православна црква (МПЦ), tr. Makedonska pravoslavna crkva (MPC)), is the largest body of Christians in the Republic of Macedonia who are united under the Archbishop of Ohrid and Macedonia.
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.
Patriarch Meletius (secular name Emmanuel Metaxakis; (21 September 1871 – 28 July 1935) was Greek Patriarch of Alexandria under the episcopal name Meletius II from 1926 to 1935. He was Metropolitan bishop of the Church of Greece in Athens (1918–20), after which he was elected Ecumenical Patriarch of Constantinople under the name Meletius IV from 1921 to 1923. He served as Greek Patriarch of Alexandria under the episcopal name Meletius II from 1926 to 1935. He was the only Eastern Orthodox hierarch in history to serve successively as the senior bishop of three autocephalous churches. A known supporter of Greek prime minister Eleftherios Venizelos, he served as Bishop in Cyprus, until he was elected Archbishop of Athens following the abdication of Constantine I of Greece, replacing Archbishop Theocletus I, a known royalist. Two years later, King Constantine I was restored to the throne, Archbishop Meletius was ousted, and former Archbishop Theocletus I was reinstated. In 1921 during the Occupation of Constantinople he was elected Ecumenical Patriarch. He resigned in 1923 following the defeat of the Hellenic army in the Greco-Turkish War. Some years later he was elected Pope and Patriarch of Alexandria. He died in 1935.
Milutin Milanković (Милутин Миланковић, pronounced; 28 May 1879 – 12 December 1958) was a Serbian mathematician, astronomer, climatologist, geophysicist, civil engineer and popularizer of science.
In mathematics, modular arithmetic is a system of arithmetic for integers, where numbers "wrap around" upon reaching a certain value—the modulus (plural moduli).
In computing, the modulo operation finds the remainder after division of one number by another (sometimes called modulus).
Mount Athos (Άθως, Áthos) is a mountain and peninsula in northeastern Greece and an important centre of Eastern Orthodox monasticism.
Nachum Dershowitz is an Israeli computer scientist, known e.g. for the Dershowitz–Manna ordering used to prove termination of term rewrite systems.
The nativity of Jesus or birth of Jesus is described in the gospels of Luke and Matthew.
The new calendarists are those Eastern Orthodox churches that adopted the Revised Julian calendar, namely the Orthodox churches of Constantinople, Alexandria, Antioch, Bulgaria, Greece, Cyprus, Romania, Poland, Czech and Slovak Orthodox Church, Albania and most of the Orthodox Church in America.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
Nicaea or Nicea (Νίκαια, Níkaia; İznik) was an ancient city in northwestern Anatolia, and is primarily known as the site of the First and Second Councils of Nicaea (the first and seventh Ecumenical councils in the early history of the Christian Church), the Nicene Creed (which comes from the First Council), and as the capital city of the Empire of Nicaea following the Fourth Crusade in 1204, until the recapture of Constantinople by the Byzantines in 1261.
In numerical analysis, numerical integration constitutes a broad family of algorithms for calculating the numerical value of a definite integral, and by extension, the term is also sometimes used to describe the numerical solution of differential equations.
The Paschal cycle, in the Eastern Orthodox Church, is the cycle of the moveable feasts built around Pascha (Easter).
Tikhon of Moscow (Тихон Московский, –), born Vasily Ivanovich Bellavin (Василий Иванович Беллавин), was a bishop of the Russian Orthodox Church (ROC).
Pentarchy (from the Greek Πενταρχία, pentarchía, from πέντε pénte, "five", and ἄρχειν archein, "to rule") is a model of Church organization historically championed in the Eastern Orthodox Church.
The Polish Autocephalous Orthodox Church, commonly known as the Polish Orthodox Church (Polski Autokefaliczny Kościół Prawosławny), or (Orthodox) Church of Poland is one of the autocephalous Eastern Orthodox Churches in full communion.
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.
A proleptic calendar is a calendar that is applied to dates before its introduction.
In arithmetic, a quotient (from quotiens "how many times", pronounced) is the quantity produced by the division of two numbers.
Rata Die (R.D.) is a system for assigning numbers to calendar days (optionally with time of day), independent of any calendar, for the purposes of calendrical calculations.
In mathematics, the remainder is the amount "left over" after performing some computation.
The Romanian Orthodox Church (Biserica Ortodoxă Română) is an autocephalous Orthodox Church in full communion with other Eastern Orthodox Christian Churches and ranked seventh in order of precedence.
The Russian Orthodox Church (ROC; Rússkaya pravoslávnaya tsérkov), alternatively legally known as the Moscow Patriarchate (Moskóvskiy patriarkhát), is one of the autocephalous Eastern Orthodox churches, in full communion with other Eastern Orthodox patriarchates.
A scatter plot (also called a scatterplot, scatter graph, scatter chart, scattergram, or scatter diagram) is a type of plot or mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data.
A schism (pronounced, or, less commonly) is a division between people, usually belonging to an organization, movement, or religious denomination.
The Serbian Orthodox Church (Српска православна црква / Srpska pravoslavna crkva) is one of the autocephalous Eastern Orthodox Christian Churches.
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
The Southern Hemisphere is the half of Earth that is south of the Equator.
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR) was a socialist state in Eurasia that existed from 1922 to 1991.
Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.
Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth).
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.
Universal Time (UT) is a time standard based on Earth's rotation.
Westernization (US) or Westernisation (UK), also Europeanization/Europeanisation or occidentalization/occidentalisation (from the Occident, meaning the Western world; see "occident" in the dictionary), is a process whereby societies come under or adopt Western culture in areas such as industry, technology, law, politics, economics, lifestyle, diet, clothing, language, alphabet, religion, philosophy, and values.
The winter solstice (or hibernal solstice), also known as midwinter, is an astronomical phenomenon marking the day with the shortest period of daylight and the longest night of the year.
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.