Ordinary Time

Ordinary Time is the current Roman Catholic system of numbering days of the church year that fall outside of the Christmas and Easter cycles. It first went into effect in Advent of 1969.

Formerly Sundays following Epiphany formed their own season and numbering began anew for Sundays after Pentecost, a system still used by many Protestant churches as well as the Eastern Rite. Ordinary Time begins with Baptism, continues with OT 2 thru OT 33 (interrupted by the movable Easter cycle) and ends with Christ the King.

Ordinary Time was adopted at the same time as the three-year lectionary. While readings changed, the sung propers were adapted from the one-year cycle with very minor adjustments. The Anglican church has adopted these, while naming the post-Pentecost Sundays Proper 7 (Sunday closest to June 22) etc... instead of OT 12.

View the Wikipedia article on Ordinary Time.

Ordinary Time	corresponding Tridentine propers	Anglican use	nearest date
Baptism of the Lord
OT 2	Epiphany II		after Jan 13
OT 3
OT 10	Pentecost IV
OT 11	Pentecost V
OT 12	Pentecost VI	Proper 7	June 22
OT 13	Pentecost VII	Proper 8	June 24
OT 14		Proper 9	July 6
OT 15	Pentecost X	Proper 10	July 13
OT 16	Pentecost IX	Proper 11	July 20
OT 17	Pentecost XI	Proper 12	July 27