I understand that such liturgies would fulfill my Sunday obligation, I just was unsure of whether going to mass on a different calendar would fulfill the celebration aspect, since in the Tridentine calendar ascension would have been celebrated on Thursday (which I believe it was). I had assumed that, if you observe the Tridentine calendar and wish to attend Tridentine mass on Sunday, that you should have gone to Tridentine mass on Thursday to fulfill the celebratory obligation for the feast of the ascension. I did not go to mass on Thursday, so I had assumed that if I was to attend mass on Sunday, then I ought to attend a liturgy that celebrates the feast of the ascension on Sunday (as it was moved by the bishop in the ordinary calendar). I didn’t know whether attending a Sunday mass that wasn’t celebrating the feast of the ascension this past Sunday would fulfill the obligation of attending the feast of the ascension mass.
Pope Benedict anticipated this very question when he promulgated
Summorum Pontificum.
He wrote into the law that there is a distinction between the
liturgical aspects of following the Extraordinary Form and the
disciplinary aspects.
With regard to disciplinary matters the current (1983) Code of Canon Law applies, as well as other current laws, and not those which were in-force in 1962*. What that means is that the obligation to attend on Holy Thursday depends on the 1983 Code. In this case, that means that if your province moves the obligation from Thursday to Sunday, then it is moved regardless of which Missal is being used.
The calendar is part of the Missal. Therefore, the calendar follows the 1962 form.
That’s the liturgical aspect. That means Ascension Thursday is celebrated on Thursday.
The obligation to attend Mass is defined in the 1983 Code, so only the Code matters.
That’s the disciplinary aspect. That means the obligation is moved to Sunday if the local bishops determine.
Once the obligation gets moved to Sunday, you have
no further obligation beyond what the canon requires (ie a Catholic Mass on Sunday or Saturday evening).
- if you need the exact quote(s) I can provide them.