Easter is tied to the moon, not the calendar. It falls on the first Sunday after the first full moon on or after March 21. That one rule is why Easter can land anywhere from March 22 to April 25, and why most people have no idea when it is until they look it up.
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The ecclesiastical spring equinox is fixed at March 21, regardless of when the astronomical equinox actually occurs (usually March 19 or 20).
Locate the first full moon that falls on or after March 21. This is the Paschal full moon, the anchor point for Easter.
Easter is the first Sunday after that full moon. If the full moon is a Sunday, Easter is the following Sunday.
This calculation was standardized at the Council of Nicaea in 325 AD to separate Easter from the Jewish Passover calendar while keeping the spring timing. The rule has not changed since, though the calendar it runs on has (Gregorian vs. Julian).
Lunar months are about 29.5 days long. The Gregorian calendar has months of 28 to 31 days. These two systems don't align neatly, so the first full moon after March 21 can land anywhere in a roughly four-week window. Add the "must be Sunday" requirement, and the total range stretches to 34 days.
the total range of possible Easter dates (March 22 to April 25)
the length of a lunar month, which doesn't match calendar months
the year the Council of Nicaea standardized the Easter calculation
A six-year span shows the unpredictability clearly.
| Year | Easter Sunday | Shift from previous year |
|---|---|---|
| 2024 | March 31 | |
| 2025 | April 20 | +20 days |
| 2026 | April 5 | -15 days |
| 2027 | March 28 | -8 days |
| 2028 | April 16 | +19 days |
| 2029 | April 1 | -15 days |
Year-to-year shifts of two to three weeks are common. There's no pattern you can internalize. That's not a memory problem. It's a calendar problem. The fix is simple: check the date once and set a reminder so you don't have to think about it again.
Western churches (Catholic, Protestant) calculate Easter using the Gregorian calendar, adopted in 1582. Eastern Orthodox churches still use the Julian calendar for ecclesiastical dates. Because the Julian calendar is currently 13 days behind the Gregorian, Orthodox Easter usually falls one to five weeks later.
In some years the two dates coincide. In 2025, for example, both Western and Orthodox Easter fell on April 20. In 2027, Western Easter is March 28 while Orthodox Easter is May 2, a gap of five weeks. If your family spans both traditions, tracking both dates matters.
Easter follows the lunar calendar, not the standard one. It falls on the first Sunday after the first full moon on or after March 21 (the ecclesiastical spring equinox). Because lunar months are about 29.5 days, the full moon lands on a different date each year, shifting Easter with it.
The Paschal full moon is the first full moon that occurs on or after March 21. It is the anchor point for calculating Easter. The word "Paschal" comes from "Pesach" (Passover), reflecting Easter's historical connection to the Jewish Passover calendar.
Easter can fall as early as March 22 and as late as April 25. That is a 34-day range. The last time Easter fell on March 22 was 1818. The next time will be 2285.
No. Western churches (Catholic, Protestant) use the Gregorian calendar for the Easter calculation. Eastern Orthodox churches use the Julian calendar, which means their Easter often falls one to five weeks later. In some years the dates align.
There have been proposals. The World Council of Churches discussed fixing Easter to the second Sunday of April in 1997. Agreement has not been reached because the calculation is tied to centuries of tradition in both Western and Eastern churches.
Easter dates can be calculated centuries ahead because the formula is purely mathematical. The challenge is not that the date is unknown, it is that people forget to check it each year. A reminder set weeks before solves that.
Set a free Easter reminder and get notified before the date arrives. No account, no app, no guessing.
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