About the same time the cycle of paschal solemnities was extended to the ninth week before Easter by the institution of stational masses for Septuagesima, Sexagesima and Quinquagesima Sundays.
The auriphrygiata is worn during Advent, and from Septuagesima to Maundy Thursday, except on the third Sunday in Advent (Gaudete), the fourth in Lent (Laetare) and on such greater festivals as fall within this time.
Advent; the days between Septuagesima and Maundy Thursday; vigils that fall on fast days, and Ember days, except the vigil before Whitsunday (red) and the Ember days in Whitsun week (red).
The Principal Church Feasts Depending On Easter, And The Times Of Their Celebration Are As Follows: Septuagesima Sunday.
The book itself, however, falls into five sections: - (a) from Advent to Christmas (cc. 1-5); (b) from Christmas to Septuagesima (6-30); (c) from Septuagesima to Easter (31-53) (d) from Easter Day to the octave of Pentecost (54-76); (e) from the octave of Pentecost to Advent (77-180).