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...

and thus has a leap year every four years without exception. The Gregorian reform shortened the average (calendar) year by 0.0075 days to stop the drift...

was the drift of 21 March from the observed equinox that led to the Gregorian reform of the calendar, to bring them back into line. Easter commemorates...

of Saint Gregory Things named for Pope Gregory VII: The Gregorian Reform, a series of reforms initiated by Pope Gregory VII and the circle he formed in...

"The Civil Reception of the Gregorian Calendar". In Coyne, G. V.; Hoskin, M. A.; O., Pedersen (eds.). The Gregorian Reform of the Calendar: Proceedings...

corrected by the Gregorian reform of 1582. The Gregorian calendar has the same months and month lengths as the Julian calendar, but, in the Gregorian calendar...

the 116th day of the year, but this has never occurred since the Gregorian reforms were implemented. The first time Easter will occur on April 25 in...

year by almost 6 hours. However, this correction is excessive and the Gregorian reform modified the Julian calendar's scheme of leap years as follows: Every...

Gregorian change in the solar calendar, if they were applied at 1 January of the Julian calendar instead of the Gregorian calendar as the reformers implemented...

introduced with the Synod of Ráth Breasail in 1111 and culminating with the Gregorian Reform which coincided with the Anglo-Norman invasion of Ireland. After the...

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

to be known as the Gregorian calendar, and has been almost universally adopted. Much of the populace bitterly opposed this reform; they feared it was...

45.1 (1970): 1–35. Cowdrey, H. E. J. (1970). The Cluniacs and the Gregorian Reform. Evans, Joan (1968). Monastic Life at Cluny 910–1157. Oxford: Oxford...

Bull of 1582 Promulgating a Reform of the Calendar". In G. V. Coyne; M. A. Hoskin; O. Pedersen (eds.). Gregorian Reform of the Calendar: Proceedings...

(1045–1046) Antipope Gregory VI Pope Gregory VII (1073–1085), after whom the Gregorian Reform is named Pope Gregory VIII (1187) Antipope Gregory VIII Pope Gregory...

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

religious reform, and a source of taxes. At the time, Irish marriage laws conflicted with those of the broader Church, and the Gregorian Reform had not...

needed] Civil law (common law) Concordat of Worms Corruption in religion Gregorian Reform Indulgence, a Church doctrine widely abused in the late medieval period...

Tusculan papacy was largely responsible for the reaction known as the Gregorian reform. Subsequent events (from 1062 onwards) confirmed a shift in regional...

Medieval examples include the Cluniac Reform in the 10th–11th centuries, and the 11th-century Gregorian Reform, both striving against lay influence over...

First Council of the Lateran Gregorian Reform Barrow, Julia (2009). "Ideology of the Tenth-Century English Benedictine 'Reform'". In Skinner, Patricia (ed...

foundation of burghs and regional markets, implementation of the ideals of Gregorian Reform, foundation of monasteries, Normanisation of the Scottish government...

Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most...

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

modified Gregorian calendar that was used in Soviet Russia between 1918 and 1940. Several variations were used during that time. The Gregorian calendar...

Leinster, in which the Reform movement had not yet established itself. The synod's deliberations were prompted by the Gregorian Reform and guided by the relatively...

included his foundation of burghs, implementation of the ideals of Gregorian Reform, foundation of monasteries, Normanisation of the Scottish government...

1057. Victor II was one of a series of German-born popes who led the Gregorian Reform. Gebhard was a native of the Kingdom of Germany in the Holy Roman Empire...

starting their weeks on Monday), and the Gregorian leap-year rule. To promote Cotsworth's calendar reform the International Fixed Calendar League was...