The Moon, the Church, and How Easter’s Date Is Chosen

If you’ve ever looked at a calendar and thought, “Wait, wasn’t Easter later last year?” Well, you’re not imagining things. Easter is one of those holidays that never seems to land on the same date twice. Last year it fell on April 20, and this year it’s on April 5. Christmas? Always December 25th. So what’s going on with Easter?

It All Comes Down to the Moon

Here’s the short answer: Easter falls on the first Sunday after the first full moon that occurs on or after the spring equinox. Yes, the moon literally decides when you’re having Easter dinner. That’s why the date bounces around the way it does. The lunar cycle doesn’t care much about our calendars.

So What’s the Vernal Equinox?

The vernal equinox is just a fancy way of saying the first day of spring (usually around March 20th, though this year it landed on March 19th).9th. Once that date passes, everyone’s waiting on the next full moon. And once that full moon shows up, the following Sunday is Easter. Simple enough, right?

READ MORE: These Easter Worship Songs Will Have Your Toes Tapping

The Connection to Passover

To really understand why Easter works this way, you have to go back to its roots. Jesus' resurrection is historically tied to the Jewish Passover, a holiday that's also based on the lunar calendar and falls on the first full moon after the spring equinox. So the moon connection isn't random at all; it's deeply rooted in history.

How the Church Made It Official

In the early days of Christianity, there was actually a debate about this. Some Christians celebrated Easter on the same day as Passover, while others insisted on waiting until Sunday, since that was the day of the Resurrection. The disagreement went on for a while until Emperor Constantine stepped in. At the Council of Nicaea in 325 A.D., it was settled: Easter would always fall on the first Sunday after the full moon. Everyone agreed, and that’s the rule we still follow today.

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Easter Sets the Tone for the Whole Season

Here’s something a lot of people don’t realize: Easter doesn’t just affect one Sunday on the calendar. Because its date shifts, it pulls a whole string of other Christian holidays along with it.

Palm Sunday, Good Friday, Ascension Day, and Pentecost all get their dates based on where Easter lands. This year, that means Palm Sunday on April 29, Good Friday on April 3, Ascension Day on May 14, and Pentecost on May 24. Move Easter, and everything else moves with it.