From a priest reader:
I am facing a dilemma. I live in a part of the country which does not observe the Ascension in a biblical manner – that is, forty days after the resurrection. Instead, we observe something that has come to be called "Ascension Thursday Sunday".
My parish offers Mass in both ordinary and extraordinary forms (at least on Sunday).
For this coming Sunday, am I to use the propers for the Sunday AFTER the Ascension or could I use the propers for Ascension (for the Mass in the Extraordinary Form)?
I have consulted the Ordo (FSSP), which doesn’t foresee (or address) the dilemma, and it only gives the propers for the Sunday after the Ascension, with no mention of what might be done in my circumstances. I would again be grateful for any help you can provide in this matter.
It seems to me that today is Ascension Thursday and that Sunday is the Sunday after Ascension. The strange innovation of Ascension Thursday Sunday is not a feature of the older, traditional understanding of the liturgical year.
I would use the formulary for the Sunday after Ascension on the Sunday after Ascension.