TABLES OF LITURGICAL DAYS

SUNDAYS
FERIAS
VIGILS
OCTAVES
FEASTS OF THE 1ST CLASS
IN THE CALENDAR OF THE UNIVERSAL CHURCH Other liturgical days of the 1st class IN PARTICULAR CALENDARS FEASTS OF THE 2ND CLASS
IN THE CALENDAR OF THE UNIVERSAL CHURCH
IN PARTICULAR CALENDARS TABLE OF OCCURENCE

For any day of the year it may be possible that a feast designated in the Common of the Time can occur coincident with a feast designated in the Proper of the Saints. The Church has provided instructions for how the Divine Office, which includes the Mass, is to be followed and prayed. Here questions about "What happens when the Feast of Saint Joseph occurs during Holy Week?" or "What is done if the Feast of Assumption falls on a Sunday?" can be easily answered. In the first example, the Feast of Saint Joseph (March 19th), being a 1st Classs Feast of the Universal Church, would be tracked on the top line of the matrix below until met with the column titled "and 1st class feria." The code at the intersection, "7", is read from the instruction table "Office of 2nd, transfer of 1st." This means that the liturgy for the day would be for the 1st class feria (as are all the days of Holy Week), and the celebration of the feast of St. Joseph would be transferred to the first available day following Low Sunday (the ferias in Easter Week also being 1st Class and priviledged).
   Likewise, if the Feast of the Assumption (Aug. 15th) should fall on a Sunday, the 1st Class Feast of the Universal Church would be tracked until meeting the column titled "and 2nd Class Sunday." The code at the intersect is "3", rendering the instruction "Office of 1st, com of 2nd at Lauds & Vespers." So the Liturgy for the day would be the Feast of the Assumption, with a commemoration of the Sunday.

Universal 1st Cl. Feast 0 7 1 1 1 1 6 8 1 7 3 3 3 7 3 7
Particular 1st Cl. Feast 3 7 1 1 1 1 8 7 1 7 3 3 3 7 3 7
Universal 2nd Cl. Feast 3 2 4 4 4 0 2 2 4 2 3 3 3 2 5 2
Particular 2nd Cl. Feast 0 2 4 4 9 5 2 2 4 2 3 3 5 2 5 2
Universal 3rd Cl. Feast 0 2 5 0 5 5 2 2 5 2 5 3 5 2 2 2
Particular 3rd Cl. Feast 0 2 9 4 5 5 2 2 5 2 5 3 5 2 2 2
1st Cl. Vigil 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
2nd Cl. Vigil 0 0 4 4 5 5 2 2 0 0 0 0 0 0 2 0
3rd Cl. Vigil 0 0 5 0 5 0 2 0 0 0 0 0 0 0 2 0
1.Office of 1st, nothing of 2nd.
2.Office of 2nd, nothing of 1st.
3.Office of 1st, com of 2nd at Lauds & Vespers.
4.Office of 1st, com of 2nd at Lauds.
5.Office of 2nd, com of 1st at Lauds.
6.Office of 1st, transfer of 2nd.
7.Office of 2nd, transfer of 1st.
8.Office of higher, transfer of other.
9.Office of moveable feast, com of other at Lauds.
Special Note: The Rubrics (Gen. Rubr. III, 15) specify that whenever The Feast of the Immaculate Conception Of The Blessed Virgin Mary coincides with the Second Sunday Of Advent, it takes precedence over the Sunday, which is then only commemorated.