The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas...

Look up Gregorian in Wiktionary, the free dictionary. Gregorian may refer to: The thought or ideology of Pope Gregory I or Pope Gregory VII (also called...

Gregorian chant is the central tradition of Western plainchant, a form of monophonic, unaccompanied sacred song in Latin (and occasionally Greek) of the...

The Gregorian Reforms were a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, c. 1050–80, which dealt with...

Gregorian is a German band headed by Frank Peterson that performs Gregorian chant-inspired versions of modern pop and rock songs. The band features both...

The adoption of the Gregorian Calendar was an event in the early modern history of most cultures and societies, marking a change from their traditional...

Gregorian Bivolaru also known as Magnus Aurolsson and nicknamed Grieg, Grig or, by the press, Guru (born 12 March 1952) is the founder of the Movement...

The Pontifical Gregorian University (Italian: Pontificia Università Gregoriana; also known as the Gregorian or Gregoriana), is a higher education ecclesiastical...

days of the Earth's orbital period, as counted in a given calendar. The Gregorian calendar, or modern calendar, presents its calendar year to be either...

respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923...

Vartan Gregorian (April 8, 1934 – April 15, 2021) was an Armenian-American academic, educator, and historian. He served as president of the Carnegie Corporation...

The Gregorian mission or Augustinian mission was a Christian mission sent by Pope Gregory the Great in 596 to convert Britain's Anglo-Saxons. The mission...

Proleptic Gregorian calendar. This year saw the beginning of the Gregorian calendar switch, when the papal bull Inter gravissimas introduced the Gregorian calendar...

calendar is 13 days behind its corresponding Gregorian date (for instance Julian 1 January falls on Gregorian 14 January). Most Catholic countries adopted...

Pentecost occur in a given year. Easter may occur on different dates in the Gregorian Calendar (Western) and the Julian Calendar (Orthodox or Eastern). The...

A Gregorian mode (or church mode) is one of the eight systems of pitch organization used in Gregorian chant. The name of Pope Gregory I was attached to...

The Gregorian telescope is a type of reflecting telescope designed by Scottish mathematician and astronomer James Gregory in the 17th century, and first...

year. The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon...

Mecca to Medina, known as the Hijrah, which equates to 622 CE in the Gregorian calendar. All religious duties, such as prayer, fasting in the month of...

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

In Roman Catholicism, the practice of Gregorian Masses is an ancient tradition in which it is believed that a continuous series of thirty consecutive...

12th of September in the Gregorian calendar (from 1900 to 2099). A gap of seven to eight years between the Ethiopian and Gregorian calendars results from...

as the Armenian Apostolic Orthodox Church, Armenian Church or Armenian Gregorian Church. The Armenian Apostolic Church should not be confused with the...

a list of adoption dates of the Gregorian calendar by country. For explanation, see the article about the Gregorian calendar. Except where stated otherwise...

The Arabic names of the months of the Gregorian calendar are usually phonetic Arabic pronunciations of the corresponding month names used in European...

366 days, by extending February to 29 days rather than the common 28. The Gregorian calendar, the world's most widely used civil calendar, makes a further...

The following pages, corresponding to the Gregorian calendar, list the historical events, births, deaths, and holidays and observances of the specified...

This created a dissociation of the calendar month from lunation. The Gregorian calendar, introduced in 1582, corrected most of the remaining difference...

specifies a week year atop the Gregorian calendar by defining a notation for ordinal weeks of the year. The Gregorian leap cycle, which has 97 leap days...

while also accounting for the month, date, and weekday of the Julian or Gregorian calendar. The complexity of the algorithm arises because of the desire...