Is the Date of Easter Related to Passover?

Christ's Empty Tomb
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Most Christians who are aware of the division between Eastern Orthodoxy and Western Christianity, both Catholic, and Protestant, know that Eastern Christians usually celebrate Easter on a different Sunday from Western Christians. In every year in which the date of Orthodox Easter is different from the Western calculation, Eastern Christians celebrate Easter after Western Christians do. They also celebrate it after observant Jews celebrate Passover, and that has led to a common misconception that Eastern Orthodox Easter is never celebrated before Passover, as Christ rose from death after Passover. So, how can we, as modern Christians, celebrate His resurrection before the Passover?

There are widespread misinformation and misconceptions about three things:

  1. How the date of Easter is calculated
  2. The relationship between the Christian celebration of Easter, the Jewish celebration of Passover at the time of Christ, and the modern Jewish celebration of Passover
  3. The reason why Western Christians (Catholic and Protestant) and Eastern Christians (Orthodox) usually (though not always) celebrate Easter on different dates.

However, there is a definitive answer to each of these questions -- read on for the explanation of each.

The Spread of an Urban Legend

Most people who are aware of the different dates of Easter in the East and the West assume that Eastern Orthodox and Western Christians celebrate Easter on different days because the Orthodox determine the date of Easter with reference to the date of the modern Jewish Passover. That's a common misconception — so common, in fact, that Archbishop Peter, the bishop of Diocese of New York and New Jersey of the Orthodox Church in America, wrote an article in 1994 to dispel this myth.

That same year, the Antiochian Orthodox Christian Archdiocese of North America published an article entitled "The Date of Pascha." (Pascha is the word used by Eastern Christians, both Catholic, and Orthodox, for Easter, and it's a word important to this discussion.) That article, too, was an attempt to dispel the widespread yet mistaken belief among Orthodox Christians that the Orthodox calculate the date of Easter in relation to the modern Jewish celebration of Passover. More recently, Fr. Andrew Stephen Damick, the pastor of St. Paul Orthodox Church of Emmaus, Pennsylvania, discussed this idea as an "Orthodox Urban Legend."

As more evangelical Protestants and Catholics have developed an interest in Eastern Orthodoxy (especially in the United States) over the past few decades, that urban legend has spread beyond the Orthodox. In years such as 2008 and 2016, when the Western celebration of Easter came before the Jewish celebration of Passover while the Eastern celebration of Easter came after, that misconception has caused great confusion -- and even anger at those (myself included) who have tried explain why the situation occurred.

How Is the Date of Easter Calculated?

In order to understand why Western Christians and Eastern Christians usually celebrate Easter on different dates, we need to start at the beginning and determine how the date of Easter is calculated. Here's where things get very interesting, because, with only very minor differences, both Western and Eastern Christians calculate the date of Easter the same way.

The formula for calculating Easter was set down at the Council of Nicaea in 325 — one of the seven Christian ecumenical councils accepted by both Catholics and Orthodox, and the source of the Nicene Creed that Catholics recite every Sunday at Mass. It is a fairly simple formula:

Easter is the first Sunday that follows the paschal full moon, which is the full moon that falls on or after the spring equinox.

For calculation purposes, the Council of Nicaea declared that the full moon is always set on the 14th day of the lunar month. (The lunar month begins with the new moon.) This is called the ecclesiastical full moon; the astronomical full moon may fall a day or so before or after the ecclesiastical full moon.

The Relationship Between Easter and Passover

Notice what isn't mentioned at all in the formula set down at the Council of Nicaea? That's right: Passover. And with good reason. As the Antiochian Orthodox Christian Archdiocese of North America states in "The Date of Pascha":

Our observance of the Resurrection is related to the "Passover of the Jews" in a historical and theological way, but our calculation does not depend on when the modern-day Jews celebrate.

What does it mean to say that Easter is related to Passover in a "historical and theological way"? In the year of His Death, Christ celebrated the Last Supper on the first day of Passover. His Crucifixion occurred on the second day, at the hour when the lambs were slaughtered in the Temple at Jerusalem. Christians call the first day "Holy Thursday" and the second day "Good Friday."

Thus, historically, Christ's Death (and therefore His Resurrection) are related in time to the celebration of Passover. Since Christians wanted to celebrate the Death and Resurrection of Christ at the same point in the astronomical cycle as it occurred historically, they now knew how to calculate it. They didn't need to rely on the calculation of Passover (their own calculation or anyone else's); they could — and did — calculate the date of Christ's Death and Resurrection for themselves.

Why Does It Matter Who Calculates the Date of Passover or Easter?

Indeed, around 330, the Council of Antioch clarified the Council of Nicaea's formula for calculating Easter. As Archbishop Peter of the Orthodox Church in America mentions in his article:

These canons [rulings made by the Council of Antioch] condemned those who celebrated Easter "with the Jews." This did not mean, however, that the dissidents were celebrating Easter on the same day as the Jews; rather, that they were celebrating on a date calculated according to the synagogal computations.

But what's the big deal? As long as the Jews calculate the date of Passover properly, why can't we Christians use their calculation to determine the date of Easter?

There are three problems.

  1. First, Easter can be calculated without any reference to the Jewish calculation of Passover, and the Council of Nicaea decreed that it should be done so.
  2. Second, to rely on the calculation of Passover when calculating Easter gives control over a Christian celebration to non-Christians.
  3. Third (and related to the second), after the Death and Resurrection of Christ, the continued Jewish celebration of the Passover no longer has any significance for Christians.

The Passover of Christ vsthe Passover of the Jews

This third problem is where the theological point comes in. We've seen what it means to say that Easter is related to Passover in a historical way, but what does it mean to say that Easter is related to Passover in a "theological way"? It means that the Passover of the Jews was a "foretaste and promise" of the Passover of Christ. The Passover lamb was a symbol of Jesus Christ. But now that Christ has come and offered Himself as our Passover Lamb, that symbol is no longer needed.

Remember Pascha, the Eastern word for Easter? Pascha is the name for the Passover lamb. As the Antiochian Orthodox Christian Archdiocese of North America notes in "The Date of Easter," "Christ is our Pascha, our Passover Lamb, sacrificed for us."

In the Latin Rite of the Catholic Church, during the stripping of the altars on Holy Thursday, we sing the "Pange Lingua Gloriosi," a hymn composed by St. Thomas Aquinas. In it, Aquinas, following Saint Paul, explains how the Last Supper becomes the Passover feast for Christians:

On the night of that Last Supper,
seated with His chosen band,
He the Paschal victim eating,
first fulfills the Law's command;
then as Food to His Apostles
gives Himself with His own hand.
Word-made-Flesh, the bread of nature
by His word to Flesh He turns;
wine into His Blood He changes;
what though sense no change discerns?
Only be the heart in earnest,
faith her lesson quickly learns.

The last two stanzas of the "Pange Lingua" are known as the "Tantum Ergo Sacramentum," and the first of those two stanzas makes it clear that we Christians believe that there is only one true Passover, that of Christ Himself:

Down in adoration falling,
Lo! the sacred Host we hail;
Lo! o'er ancient forms departing,
newer rites of grace prevail;
faith for all defects supplying,
where the feeble senses fail.

Another common translation renders the third and fourth lines thus:

Let all former rites surrender
to the Lord's New Testament.

What are the "former rites" mentioned here? The Passover of the Jews, which has found its completion in the true Passover, the Passover of Christ.

Christ, Our Paschal Lamb

In his homily for Easter Sunday in 2009, Pope Benedict XVI concisely and beautifully summed up the Christian understanding of the theological relationship between the Passover of the Jews and Easter. Meditating on 1 Corinthians 5:7 ("Christ, our Paschal lamb, has been sacrificed!"), the Holy Father said:

The central symbol of salvation history -- the Paschal lamb -- is here identified with Jesus, who is called “our Paschal lamb”. The Hebrew Passover, commemorating the liberation from slavery in Egypt, provided for the ritual sacrifice of a lamb every year, one for each family, as prescribed by the Mosaic Law. In his passion and death, Jesus reveals himself as the Lamb of God, “sacrificed” on the Cross, to take away the sins of the world. He was killed at the very hour when it was customary to sacrifice the lambs in the Temple of Jerusalem. The meaning of his sacrifice he himself had anticipated during the Last Supper, substituting himself -- under the signs of bread and wine -- for the ritual food of the Hebrew Passover meal. Thus we can truly say that Jesus brought to fulfilment the tradition of the ancient Passover, and transformed it into his Passover.

It should be clear now that the Council of Nicaea's prohibition on celebrating Easter "with the Jews" has a deep theological meaning. To calculate the date of Easter with respect to the modern Jewish celebration of Passover would imply that the continued celebration of the Passover of the Jews, which was only ever meant to be a type and symbol of the Passover of Christ, has to mean for us as Christians. It does not. For Christians, the Passover of the Jews has found its completion in the Passover of Christ, and, like "all former rites" it must "surrender to the Lord's New Testament."

This is the same reason why Christians celebrate the Sabbath on Sunday, rather than retaining the Jewish Sabbath (Saturday). The Jewish Sabbath was a type or symbol of the Christian Sabbath -- the day that Christ rose from the dead.

Why Do Eastern and Western Christians Celebrate Easter on Different Dates?

So, if all Christians calculate Easter the same way, and no Christians calculate it with reference to the date of Passover, why do Western Christians and Eastern Christians usually (though not always) celebrate Easter on different dates?

While there are minor differences between East and West in how the date of the paschal full moon is calculated that do affect the calculation of the date of Easter, the primary reason why we celebrate Easter on different dates is because the Orthodox continue to calculate the date of Easter according to the older, astronomically inaccurate Julian calendar, while Western Christians calculate it according to the much more astronomically accurate Gregorian calendar. (The Gregorian calendar is the calendar we all -- East and West -- use in daily life.)

Here's how the Antiochian Orthodox Christian Archdiocese of North America explains it in "The Date of Easter":

Unfortunately, we have been using the 19-year cycle in calculating the date of the Resurrection ever since the fourth century without actually checking to see what the sun and moon are doing. In fact, besides the imprecision of the 19-year cycle, the Julian calendar itself is off by one day in every 133 years. In 1582, therefore, under Pope Gregory of Rome, the Julian Calendar was revised to minimize this error. His "Gregorian" calendar is now the standard civil calendar throughout the world, and this is the reason why those who follow the Julian Calendar are thirteen days behind. Thus the first day of spring, a key element in calculating the date of Pascha, falls on April 3 instead of March 21.

We can see this same effect of the use of the Julian calendar in the celebration of Christmas. All Christians, East, and West agree that the Feast of the Nativity is December 25. Yet some Orthodox (though not all) celebrate the Feast of the Nativity on January 7. That doesn't mean that there is a dispute between Christians (or even just among Orthodox) about the date of Christmas: Rather, December 25 on the Julian calendar currently corresponds to January 7 on the Gregorian one, and some Orthodox continue to use the Julian calendar to mark the date of Christmas.

But wait — if there's currently a 13-day difference between the Julian calendar and the Gregorian calendar, shouldn't that mean that the Eastern and Western celebrations of Easter should always be 13 days apart? No. Remember the formula for calculating Easter:

Easter is the first Sunday that follows the paschal full moon, which is the full moon that falls on or after the spring equinox.

We've got several variables in there, including the most important one: Easter must always be on a Sunday. Combine all of those variables, and the Orthodox calculation of Easter can vary by as much as a month from the Western calculation.

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