KnowThisKey Takeaways
Key Takeaways
- 1Easter is the central festival of the Christian calendar, commemorating the resurrection of Jesus Christ, understood in Christian teaching as occurring three days after his crucifixion.
- 2Unlike Christmas, Easter's date is not fixed — it's calculated each year based on the lunar calendar, specifically the first Sunday after the first full moon following the spring equinox.
- 3Western churches (Catholic and most Protestant) and Eastern Orthodox churches often observe Easter on different dates because they use different calendars (Gregorian vs. Julian) to calculate it, and occasionally, though not always, they align.
The concept
Why does Easter fall on a different date each year, unlike Christmas?
Worked examples
Example 1: A typical Western Easter Sunday (baseline case)
Example 2: Orthodox Easter on a different date — a documented variation
Example 3: Easter's secular customs today (real-world / applied case)
Common mistakes
Common Mistakes
Assuming Easter falls on a fixed calendar date like Christmas.
→ Easter is a movable feast, calculated each year as the first Sunday after the first full moon following the spring equinox, so its Gregorian date shifts between March 22 and April 25.
Assuming Western and Orthodox churches always celebrate Easter on the same date.
→ They use different calendars (Gregorian vs. Julian) and calculation rules, so their Easter dates often differ, sometimes by several weeks, occasionally aligning.
Treating Easter egg and bunny customs as having a Christian scriptural origin.
→ These are widely understood by historians to be secular or pre-Christian springtime symbols of renewal that became associated with the Easter season over time, not elements described in the Christian resurrection accounts themselves.
Common misconception
“Easter's date is fixed on the calendar each year, similar to Christmas's December 25.”
Unlike Christmas, Easter is a "movable feast" — its date is recalculated every year according to a rule set at the Council of Nicaea in 325 CE: the first Sunday after the first full moon following the spring equinox. This is why Easter can fall anywhere between March 22 and April 25 in the Gregorian calendar used by Western churches, and why Eastern Orthodox churches, using the Julian calendar and an additional rule tied to Passover, often observe it on a different date entirely.
What to do next
What to do next
- Next time you check this year's Easter date, remember it's calculated from the lunar calendar and spring equinox, not fixed — it will fall on a different Sunday than last year.
- If you see 'Orthodox Easter' mentioned separately from 'Easter', recognize it's a calculation difference (Julian vs. Gregorian calendar), not a separate holiday with different meaning.
- Notice which Easter customs you encounter are religious (church services, Lent, Holy Week) versus secular and pre-Christian in origin (egg hunts, the Easter Bunny).
- If you're tracking Lent, count back 40 days (not counting Sundays) from Easter Sunday to find Ash Wednesday, its traditional starting point.