So what's all this I hear about Ordinary Time, etc.? How did it develop in Western Churches (I assume), and are there any parallels in Eastern Churches? It gets mentioned a surprising amount in Catholic conversation.
Google is your friend, too.
Ordinary Time refers to season of the Christian liturgical calendar, particularly the calendar of the ordinary form of the Roman rite of the Catholic Church, although some other churches in Western Christianity also use the term. The English name "Ordinary time" translates the Latin term tempus per annum (literally "time through the year").
Since 1970 in the ordinary form of the Roman rite in the Catholic Church, Ordinary Time comprises two periods: one beginning on the day after the Feast of the Baptism of the Lord (the end of the Christmas season) and ending on the day before Ash Wednesday, the other beginning on the Monday after Pentecost (the conclusion of Eastertide) and continuing until the Saturday before Advent Sunday (The First Sunday of Advent).
The Church numbers the weeks of Ordinary Time. Several Sundays bear the name of feasts or solemnities celebrated on those days, including Trinity Sunday and the Feast of Christ the King.
The liturgical color normally assigned to Ordinary Time is green.http://en.wikipedia.org/wiki/Ordinary_Time