[Transcriber's note: The following table is from https://en.wikipedia.org/wiki/Dominical_letter.
A: common year starting on Sunday (or ending on Sunday) B: common year starting on Saturday (or ending on Saturday) C: common year starting on Friday (or ending on Friday) D: common year starting on Thursday (or ending on Thursday) E: common year starting on Wednesday (or ending on Wednesday) F: common year starting on Tuesday (or ending on Tuesday) G: common year starting on Monday (or ending on Monday) AG: leap year starting on Sunday (or ending on Monday) BA: leap year starting on Saturday (or ending on Sunday) CB: leap year starting on Friday (or ending on Saturday) DC: leap year starting on Thursday (or ending on Friday) ED: leap year starting on Wednesday (or ending on Thursday) FE: leap year starting on Tuesday (or ending on Wednesday) GF: leap year starting on Monday (or ending on Tuesday)]
Holy-days On Which There Is A Strict Obligation To Hear Mass, And Refrain From Servile-works.
All Sundays in the Year. Ascension of our Lord. Corpus Christi. January 1--The Circumcision of our Lord. January 6--The Epiphany. March 17--The Feast of St Patrick. March 25--The Annunciation of the B.V.M. June 29--St. Peter and St. Paul. August 15--Assumption of the B.V.M. November 1--Feast of All Saints. December 25--Nativity of our Lord Jesus Christ.
[The obligation is taken away on all other days, by decrees of Popes Pius VI. and VIII.]
The Quarter-tenses, or Ember-days, being the Wednesdays, Fridays, and Saturdays, next after the first Sunday of Lent; after Whit-Sunday; after September 14th: and after December 13th.
The Eves of St. Peter and St. Paul; of the Assumption of the Blessed Virgin Mary; of All Saints; and of Christmas-day.
All the Sundays in Lent, except when the use of meat is allowed by the Archbishop or Bishop of the diocese.
N. B.--Eggs are forbidden on Fridays, when a fast falls on them; and if a Fasting Day fall on a Sunday, the fast is kept on the Saturday before. If Christmas-day fall on a Friday, neither fast nor abstinence is observed.
N.B.--The Catholic Church commands all her children to be present at the great Eucharistic Sacrifice, which we call the Mass, and to rest from servile work, on Sundays and Holy-days.