First Sunday of Advent

The Christian Liturgical calendar is considered a moveable feast so from year to year the dates of events, feasts etc can change. Some dates, for example, Christmas Day are fixed. Moveable events include Advent, Easter, Pentecost. These are set by the lunar calendar and based the Gregorian Calendar (introduced by Pope Gregory XIII) The First Sunday of Advent for the 2011-12 liturgical year is Sunday, November 27. Advent marks the beginning of the Christian Liturgical Year. The new Missal will be introduced on the First Sunday of Advent. Note on Pope Gregory XIII: Pope Gregory XIII (7 January 1502 – 10 April 1585), born Ugo Boncompagni, was Pope from 1572 to 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally-accepted civil calendar to this date.