Advent Reading Guide
Advent (from the Latin word adventus, meaning “coming”) is a season of the Christian church, the period of expectant waiting and preparation for the celebration of the Nativity of Jesus; in other words, the period immediately before Christmas. It is the beginning of the Western liturgical year and commences on Advent Sunday. The Eastern churches begin the liturgical year on 1 September. The Eastern Christian equivalent of Advent is called the Nativity Fast but it differs both in length and observances.
The progression of the season may be marked with an Advent calendar, a practice introduced by German Lutherans. At least in the Roman Catholic calendar, Advent starts on the fourth Sunday before December 25; in other words, the Sunday between November 27 and December 3 inclusive.— Wikipedia