I’m wondering if this all has to do with whatever it is that we see in the liturgy of the hours. Each Sunday has two evening prayers, one said on Saturday evening, and one said on Sunday evening. There is no Saturday evening prayer, so to speak. Maybe once 4 or 5 pm passes on Saturday, then according to the Church it is Sunday, no matter what. Like, maybe Sunday is a longer day of the week than the other days of the week?
Perhaps what they are saying is that it is no longer Dec 8 on Saturday evening. Then it would not be a matter of which readings. Rather, it would be a matter of which actual day it is.
Just trying to puzzle out whatever might be the logic of it all here.
Pug, you may have hit the nail on the head. You see, there is some inconsistencies with the way that Canon law is read. Sunday, according to Canon Law and the secular world, lasts from midnight Sunday to 11:59 (or midnight Monday) PM Sunday. However, the Church allows for the anticipated Sunday vigil to be celebrated on and/or after 4PM. This means that a “new” day has already begun in the eyes of the Church, since it is now, technically, Sunday that we are observing from 4PM onward. Therefore, when putting the two together, something is amiss.
Now, I use my experience in the Texas Legislature as a means of trying to “puzzle out” the logic, as you put it. The Texas Legislature has the authority to suspend the rules. While a debate may spill into past midnight (the following calendar day), the House of Representatives still considers itself to be on the same “legislative” day that it began at 10AM (the previous calendar day). Let’s say the debate began at 10AM Tuesday and it is now 3:00AM Wednesday (yes, it’s been known to happen, trust me, I’ve lived through many of those), irrespective of what the normal calendar says, the House calendar is still on the same legislative day.
This, perhaps, holds true when it comes to the liturgy. After 4PM Saturday (when the first anticipated Sunday Mass may be celebrated), the Church has alread entered into “Sunday”. If that were not the case and we strictly went by Canon law’s configuration of a day, then, conceivably, we could not celebrate “Sunday” yet because we are bound by the calendar day’s reckoning, as per Canon law. However, because we are now after 4PM on a Saturday, the anticipated Sunday Mass takes precedence, just as the anticipated vigil Mass on Friday evening for the Immaculate Conception now takes precedence over the Mass for Friday, of the First Week of Advent.