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Does the Sunday observance begin on Saturday evening, in imitation of the Jewish sabbath?

Full Question

In ancient Judaism the sabbath was from sundown on Friday to sundown on Saturday. If Sunday is the Christian sabbath, should we celebrate it from sundown on Saturday to sundown on Sunday? Is this why attending an anticipatory Mass on Saturday evening fulfills our Sunday obligation?


The Sunday obligation applies to the modern Sunday, reckoned from midnight to midnight. This was established by canon 1246 of the 1917Code of Canon Law.

The ancient Jews reckoned days from sundown to sundown, meaning that for them the first part of the day was evening. This is why Genesis 1 says things like, “And there was evening, and there was morning–the first day” (Gn 1:5). The same custom was observed by the ancient Phoenicians, Athenians, Arabs, Germans, and Gauls. Today Jews and other groups who keep the sabbath, such as the Seventh-day Adventists, continue to celebrate it from sundown Friday to sundown Saturday. This way of reckoning time was not the only one in the ancient world. For example, the Romans reckoned days from midnight to midnight–the system we use today.

The option of attending an anticipatory Mass on Saturday evening has nothing to do with the fact the sabbath began at sundown. This provision was originally introduced for Catholics who had to miss Sunday Mass for a good reason (for example, because they had to work). The 1983 Code of Canon Law simply states: “The precept of participating in the Mass is satisfied by assistance at a Mass which is celebrated anywhere in a Catholic rite either on the holy day or on the evening of the preceding day” (can. 1248, 1).

Sunday is often spoken of as “the Christian sabbath,” but this is not a technical description. Sunday is not a strict replacement for the sabbath (which has been abolished), but a day the Church instituted to fulfill a parallel function. Thus Ignatius of Antioch, the earliest Church Father to address this question, states that Christian converts “have given up keeping the sabbath and now order their lives by the Lord’s Day instead, the day when life first dawned for us, thanks to him [Christ] and his death” (Letter to the Magnesians 9 [A.D. 107]).


  1. dbell Reply

    Sorry to say, the response is not totally correct….

    All Holy Days of Obligation, by decree from the Vatican start at Sundown the night before to Midnight that day. In the US the USCCB declared sundown to be from 5PM onwards, local time, to quell questions as to the definition of sundown. The practice of Vigil Masses, which initially were different readings and prayers, as in the night before Easter Day, was happening at Sundown on Holy Feast Days and was going on before this formal decree in the 70s and lead to the change in wording in the 1983 Code of Canon Law to help in the clarification. In Christ, Brother Don – Diocesan Hermit

  2. Christian Catsanos Reply

    If this is the case then why is the evening prayer of Sundays and solemnities celebrated the day before?

    1. Bryan Amore Reply

      Good question. The practice of beginning Sunday with Evening Prayer has been established long before the 1983 revision of the code of canon law mentioned above. I think the answer guy didn’t do his research well.

  3. Christian Catsanos Reply

    If what you mean is that the person who wrote this article is incorrect, I checked this answer against a trusted liturgist and he confirmed it has no basis in fact. I shouldn’t really copy his email to me into the comments section as that’s not fair to him but he did say that this is not the origin of the Vigil Mass.

  4. william neal Reply

    the most important thing is that you go to Mass. Either the Saturday before The Lord’s Day or on Sunday itself.

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