I think that there is a distinction between anticipated masses and vigil masses that we are missing here:
An anticipated mass is, I believe, the mass of a certain day said before that day. A mass, with its particular variable parts, said on the day to which these variable parts are proper cannot be an anticipated mass.
A vigil mass is a particular mass said the evening before the day to which it is a watch. In effect a vigil mass prepares for the day itself (but it is not the day). Christmas Eve is not Christmas. Halloween is not All Saint’s. In the prayers said by the priest in the Easter Vigil the day on which the Easter Vigils occurs is never called Easter, nor are the sacraments called Easter Sacraments. However, the prayers said on Easter Day refer to the day as the day of Easter Joy and to the sacraments as Easter Sacraments.
Now, again according to canon 1248, the
only reason why an anticipated mass or a vigil mass may satisfy a holy day of obligation is because it occurs “in the evening of the preceding day.” If the evening of the preceding day before a solemnity is automatically considered the day itself then there would be no need for a vigil or for an anticipated mass (the entire question of this thread would be moot).
The
General Norms for the Liturgical Year and the Calendar do indeed state that the observance of a solemnity begins with Evening Prayer I:
- Solemnities are counted as the principal days in the calendar and their observance begins with evening prayer I of the preceding day. Some also have their own vigil Mass for use when Mass is celebrated in the evening of the preceding day. The celebration of Easter and Christmas, the two greatest solemnities, continues for eight days, with each octave governed by its own rules.
It is important to note, however, that the distinction of
day is still kept. If Sundays began on Evening Prayer 1 then the evening of the preceding day would be Friday evening. Does anyone believe that a Sunday obligation can be satisfied by any mass said on Friday after 4:00 PM? Even if it has the Sunday readings?
Again, an anticipated mass satisfies the obligation because of the time in which it occurs; not because it is anticipating Sunday. The anticipated mass is not proper to Saturday. I suspect the reason why the Sunday Mass is anticipated is so that those who choose to fulfill their obligation on the preceding evening can partake of the Sunday Liturgy.
I do not think that Saturday becomes a “legal” Sunday even if Sunday is “observed” on Saturday. If it was a “legal” Sunday (like the continuing of a session or meeting in parliamentary procedure), then there would be no need for an anticipated mass.
Also if Saturday Evening was legally Sunday the anticipated mass would count toward the two (and sometime three) masses a priest is permitted to celebrate on Sunday.
It therefore
seems that any mass (for it could be either Sunday or Immaculate Conception) celebrated after 4:00 PM could satisfy the obligation for the Second Sunday of Advent or the Immaculate Conception (of course one mass cannot do both).