Placed in the order of the civil calendar, the ten days (apart from Sundays) that this canon mentions are:
The number of holy days of obligation was once much greater. With the motu proprio Supremi disciplinae of 2 July 1911, Pope Pius X reduced the number of such non-Sunday holy days from 36 to 8 (the above 10 minus the feasts of the Body and Blood of Christ and Saint Joseph). The present list was established in 1917.
In many countries the bishops had obtained, even before the time of Pope Pius X, the Holy See's approval to diminish the number of non-Sunday holy days of obligation, making it far less than 36. Today too, Episcopal Conferences have availed themselves of the authority granted them in law to reduce the number below the ten mentioned above.
Non-Sunday holy days of obligation all have the rank of solemnity. Accordingly, if in Ordinary Time one of them falls on a Sunday, the Sunday celebration gives way to it; but the Sundays of Advent, Lent and Easter take precedence over all solemnities, which are then transferred to another day.
Some countries have as holy days of obligation feasts that are not among those listed in canon 1246. Ireland has Saint Patrick's Day. Germany has "Second Christmas Day" (26 December), Easter Monday and Pentecost Monday (Whit Monday).
In countries where they are not holy days of obligation, three of the ten feast days listed above are assigned to a Sunday as their proper day:
If they are thus assigned to a Sunday, they are not included in the following national lists of holy days of obligation, since in every country all Sundays are holy days of obligation.Liturgy Office)
In addition, some dioceses have one or more of the following holy days of obligation:
The solemnities of Saint Joseph, Saints Peter and Paul and the Immaculate Conception of Mary are observed nowhere in Germany as holy days of obligation.
Instead of being transferred to the following Sunday, the Ascension of Our Lord, though not a holy day of obligation in Greece, is kept on Thursday of the sixth week of Easter, in order to celebrate it on the same day as the Orthodox Church of Greece.Liturgical Calendar)
However, whenever January 1 (solemnity of Mary, Mother of God), August 15 (solemnity of the Assumption), or November 1 (solemnity of All Saints) falls on a Saturday or Monday, the precept to attend Mass is abrogated. In Hawaii, in 1992, the Bishop of Honolulu, pursuant to an indult from the Holy See, established the Feast of the Immaculate Conception and Christmas as the only two holy days of obligation to be observed in the State of Hawaii.
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