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In Eastern Orthodoxy, the Church Year or Liturgical Year is referred to as "the Indiction."
Advent
The cycle changes with the beginning of a new Liturgical Year on the first Sunday of Advent.
The Liturgical Year, with its structure of seasons and feast days, evolved over centuries starting in the early Christian church. It was influenced by both Jewish and Roman calendars and was gradually formalized by various church councils and liturgical reforms. The basic framework of the Liturgical Year was established by the medieval period.
it is called the church's calendar
Advent begins the Liturgical year in the Roman Catholic Church
The first Sunday of Advent.
the Sunday that is the center of the entire church is Easter Sunday.
Roman Catholic AnswerNo, the Liturgical Year starts four Sundays before Christmas with the season of Advent; which begins the week after the Solemnity of Christ the King-the last Sunday of the Liturgical Year.
Holy Week, ending with Easter, is the holiest time of the liturgical year, with Christ Death and Resurrection being the climax.
The first Sunday of Advent marks the beginning of a new liturgical year.
The feast of Christ the King ends the liturgical year.