A
Aramis
Guest
the specifics of what fulfills Sunday’s obligation varies by church sui iuris. For Roman Church Catholics, it meets the letter of the law.There is no requirement regarding the readings used for a Eucharistic celebration in fulfilling the obligation for a Sunday or Holy Day of obligation. The liturgical day is always midnight to midnight, although the celebration of it is sometimes anticipated on the previous evening, or even transferred to a different day.