Commemoration of St. Thomas of Canterbury (Bishop and Martyr)
Within the Octave of the Nativity, I and II class votive Masses of the Dead are permitted.
Mass Puer natus assigned to the days within the Octave of the Nativity (in the Missal, immediately following December 28); Gloria; commemoration of St. Thomas of Canterbury; Credo; preface and Communicantes of the Nativity
Matins: Invitatorium, Hymn, and 9 antiphons and 9 psalms from the Nativity (joined, not said as three nocturns); verse as found at the conclusion of the psalms for the Nativity (in its third nocturn); 3 lessons proper to December 29; Te Deum
Lauds: Antiphons of the Nativity with Sunday psalms; Hymn A solis ortus; commemoration of St. Thomas of Canterbury
Hours: Ferial psalms and antiphons; remainder as on the feast of the Nativity
I Vespers: Of the Sunday within the Octave of the Nativity; antiphons and psalms from the Nativity; remainder proper
Compline: Of Sunday