Easter is the traditionally biggest holiday in the Christian calendar – even more important than Christmas! It commemorates the resurrection of Jesus after he was crucified on the cross, symbolizing salvation and faith. Easter Sunday in 2026 falls on April 5. But why does the date change every year, and how is the proper Sunday determined? Find out how the Church calculates Easter Sunday, why it changes each year, and why there are usually two different Easters each spring.
Understanding Easter’s Date Determination
Determining the date of Easter is surprisingly complex. Remember that modern-day Easter is built directly upon millennia of tradition, and all stems from one event that happened over 2,000 years ago. When the first Easters were being celebrated, it wasn’t an easy process to coordinate.
There were (and still are) many factors to consider when determining the date for Easter, causing more problems than you’d think.
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Easter 2026
April 5, 2026 12:01 am
Easter Sunday 2026
To get you up to speed, this is the historical background information you need to know about the history of Easter and the process of determining its date every year:
- There was no way to communicate with all the churches at once for coordination (no printing press and no mass distribution)
- There were no exact calendars or clocks; all time-keeping practices were observational rather than pre-calculated
- The early Christian calendar was directly informed by the Hebrew calendar (early Christians were Jewish first)
- The original Roman calendar (used by much of the Roman Empire but not the Hebrews) was exceedingly chaotic and irregular
- The Julian calendar, established in 46 BCE, was a lot more organized, but it was at odds with the Hebrew calendar since it was not lunisolar
- The rise of the Holy Roman Empire and the Gregorian calendar in 1582 split Christian sects into Eastern Orthodox and Western Roman Catholic, causing two different holiday calendars
- The dates of Easter need to be oriented to Passover in a specific way
Believe it or not, there are even finer details to know if you really want to get into the nitty-gritty of the whole topic. For today, this information gives you all you need to have a firm understanding. Keep these facts in mind as we expand on the reasons why Easter’s date became such a complicated topic.
March 28.
April 16.
April 1.
The Role of the Lunar Calendar
Throughout history, some cultures and civilizations used the lunar calendar to calculate times and dates, and others used the solar calendar. Some even used a combination, known as the lunisolar calendar.
The Hebrew calendar, which the early Christians used as well, is a lunisolar calendar.
For reasons we’ll expand upon in the next section, Easter is calculated according to this calendar.
Easter’s date is determined to be the first Sunday after the first full moon following the vernal (spring) equinox.
However, many caveats make this statement more complicated than it appears.
Historical Context and the Council of Nicaea
In Jewish tradition, time and dates are determined according to the lunisolar calendar.
The Passover feast was meant to occur on the 14th or 15th day of the Hebrew month Nisan, on whichever day ended up being the 100% full moon.
❗Importantly: Passover’s date occurs on the same moon-phase day in the Hebrew lunisolar calendar each year, which is not the same as the Gregorian calendar. Therefore, it’s not a static holiday according to the calendar (Gregorian) that we use today. And therefore, Easter is calculated on a lunisolar basis as well.
According to the Bible, Jesus was crucified very close to or on the day after Passover (different theologians have different conclusions). The important part is that the Resurrection was after Passover, meaning Christians needed to celebrate Easter after Passover. Since it wasn’t possible to calculate which day (the 14th or 15th) would be the full moon and therefore Passover in advance, some early Christians grew frustrated with the unpredictability.
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Different churches came to different conclusions, and the discrepancy caused internal strife in the early Christian church. To address concerns, a Church-wide meeting, the first of its kind, was called.
The Council of Nicaea was held in 325 CE. One of the goals of the meeting was to establish the rules for when to celebrate Easter so all Christians would celebrate on the same day.
The rules they came up with were:
- No longer would the date depend on the non-calculable astronomical full moon. Instead, the ecclesiastical full moon, which always occurs 14 days after the new moon, would be used.
- The Paschal full moon is the full moon that happens after the ecclesiastical vernal equinox.
- March 21st became the ecclesiastical vernal equinox. Sometimes the astronomical equinox is a day sooner or a day later.
- Easter is to be celebrated on the Sunday after the Paschal full moon.
It took several centuries for a more reliable computational method of determining dates to evolve, known as the computus. It turns out that creating an accurate calendar without the kind of technology we have today is very difficult.
Creating these fixed dates was intended to get rid of the variability that comes with relying on observing the moon. To a great degree, these rules helped create a coherent schedule that all the churches across the Christian empire could use.
The vernal, or spring, equinox is the day when the sun is positioned exactly over the equator. As a result, the day has the same amount of daylight and nighttime hours, and signals the transition into spring for the northern hemisphere: days will grow longer, nights will grow shorter, and the temperature will become warmer.
Why Easter's Date Changes Annually
So, why does Easter change every year? With all the rules set by the Council of Nicaea, you might think that it would narrow the date of Easter down to the same day every year, like the 2nd Sunday in April, for example.
However, because the sun and moon move at paces that don’t perfectly align with our calendar, the result is that there is a lot more variability in the new moons, full moons, and equinoxes than you’d expect.
Furthermore, the interplay between the full moon, the days of the week, time and timezones make the affair even more confusing. Let’s take a look at a simpler Easter year calculation and a complex Easter year calculation to see the differences.
Simple Year: 2024
Thurs. 21 March
Ecclesiastical Equinox
The established date of spring dictated by the Church.
Mon. 25 March
Paschal Full Moon
Easter is clearly the Sunday after this date.
Sun. 31 March
Easter Sunday (Gregorian / Western Tradition)
Easter was celebrated with no confusion.
Complex Year: 2025
Fri. 21 March
Ecclesiastical Equinox
The established date of spring dictated by the Church.
Sat. 12 April
Paschal Full Moon (in North America)
Reason dictates that the next day, Sunday, April 13th, should be Easter. But it wasn’t! This is because the full moon didn’t occur until Sunday, April 13th, in the European time zones. According to the Church, the full moon was *on* Sunday, therefore it was necessary to wait until the *following* Sunday to celebrate.
Sun. 21 April
Easter Sunday
The official Sunday after the full moon.
Notice that the time zone used is the one that encompasses the center of the Catholic world.
According to the rules as they stand now, Easter can only ever occur between March 22nd and April 25th, in the Gregorian tradition.
There is another thing to consider: the Eastern Orthodox tradition. In 1582, the Gregorian calendar was introduced as a more accurate way to track and predict the days of the year. Christians in Western regions adapted their religious calendars to this new system.
However, the Eastern Orthodox Christians wanted to keep using the Julian calendar since it was more traditional. They eventually converted to a Revised Julian calendar in the 1920s, which made fixed-date holidays like Christmas the same as the Western calendar, but the dates of movable holidays are still different.
For this reason, Orthodox Easter (and other holidays) are usually on different days from Western traditions. Sometimes, Easter is on the same day for both traditions, but other times, like in 2024, the difference was 35 days.
Easter Dates for 2026 and Subsequent Years
Determining Easter Day on your own is possible, now that you know more about the rules of the equinox, full moon and time zones. But it’s not very easy. It’s much simpler to look up the dates when making plans.
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Easter Dates from 2026 to 2029
| Year | Gregorian Date | Orthodox / Julian Date |
|---|---|---|
| 2026 | April 5th | April 12th |
| 2027 | March 28th | May 2nd |
| 2028 | April 16th | April 16th |
| 2029 | April 1st | April 8th |
Calculating the date of Easter seems like it should be a simple task. However, the close ties with Jewish Passover, which is calculated with the lunisolar Hebrew calendar, mean that Easter is also influenced by the lunisolar calendar. It doesn’t fit perfectly within the Gregorian calendar we use today, but the Church manages to make it work.
When planning your Easter Sunday and Monday, make sure you double-check the date so you aren’t caught by surprise!
References
- Canadian statutory holidays in 2026. (2026). In canada-holidays.ca. https://canada-holidays.ca
- Easter. (n.d.). In Encyclopedia Britannica. https://www.britannica.com/topic/Easter-holiday
- Joe Rao published. (2025). Easter is coming late in 2025, astronomically speaking. Here’s why. In Space. https://www.space.com/the-universe/moon/easter-is-coming-late-in-2025-astronomically-speaking-heres-why
- Ken, P. (2025). Complicated Computus. In Living an Ecumenical Life. https://ecumenicallife.com/2025/04/13/complicated-computus
- When is Easter? (n.d.). In Royal Observatory. https://www.rmg.co.uk/stories/time/when-easter
- When Is Easter 2026? Why Does the Date Change? (2026). In The Old Farmer’s Almanac. https://www.almanac.com/content/when-is-easter
- Why does the date of Easter move around? (n.d.). In BBC Bitesize. https://www.bbc.co.uk/bitesize/articles/zn2njhv
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