(some years include small portions of May and December). The last Sunday before Advent is celebrated as the Solemnity of Christ the King (white) and in the Roman Catholic Church always takes the place of the 34th Sunday in Ordinary Time.
The actual number of weeks of Ordinary Time in any given year can total 33 or 34. When there are only 33 weeks (which is more common), the week that would normally follow the resumption of Ordinary Time following Pentecost Sunday is omitted. For example, in 2011, the Sunday before Ash Wednesday was the 9th Sunday in Ordinary Time, but the day after Pentecost Sunday began the 11th Week in Ordinary Time.