The USCCB site is in error....although it’s probably more accurate to say that whoever made the site made a mistake, rather than to say that the USCCB erred. Check any official liturgical book of the modern Roman Rite. This feast is in the Christmas Season section; it takes the place of the First Sunday of Ordinary Time, just as the Solemnity of Christ the King takes the place of the 34th Sunday of Ordinary Time—except there is no change of liturgical season there, as there is with the Baptism of the Lord.
Ordinary time lasts from the Monday after this Sunday to the Tuesday before Lent.
(Emphasis mine. For those interested, note the footnotes there about "Dominical letters.")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[1][2]), 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.
"After the Feast of the Baptism of the Lord, Ordinary Time Begins" --ORDO
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.