When is Easter?

Posted by Randy | Labels: , , , , , , , , , | Posted On Saturday, April 23, 2011 at 10:28 PM

Easter is so late this year - April 24. In fact, we're only two weeks away from Mother's Day. Why did it happen this way, and why is it sometimes as early as March.

To answer this, I read some material by History professor Steve Ware from an article in The Christian Century, as well as information in the Wikipedia website. The short answer is that Easter falls on the first Sunday after the first full moon after the vernal equinox. Huh? 

The equinox is when the equator is perpendicular to the sun. The center of the sun is in the same plane as the Earth's equator. At this point in time, if you were standing on the equator, the sun would appear directly overhead. It typically occurs around March 20/21 in the spring, called the "vernal equinox," and around September 22/23 in the fall, called the "autumnal equinox." The word "equinox" is derived from the Latin words aequus, meaning equal, and nox, meaning night. Although it's not exactly the case, we can think of the equinox as being the time when the length of the day and the night are approximately the same. The equinox marks the official change of seasons, from winter to spring or summer to fall.

The short version is that in 325 A.D., Constantine, emperor of the Holy Roman Empire, convened the Council of Nicea. Among the business before the council was a desire to establish a uniform date for Easter. Out of the discussion and debate came the "Easter Rule," setting Easter on the first Sunday after the first full moon after the vernal equinox. However this decision was not unanimous. 

There was not yet what we now consider a Pope. Instead, there were bishops from across the church, though over time the Bishop of Rome in the western portion of the Church began to take on greater and greater preeminence, and eventually became what we today know as the Pope. The eastern bishops of the Church (more closely associated with Constantinople) at that time wanted to schedule Easter in conjunction with the Jewish Festival of Passover since, after all, Jesus went to Jerusalem, in the first place, to celebrate Passover. The Western bishops (more closely associated with Rome) preferred a date corresponding with the beginning of spring, because that was the time already established for a lot of pagan celebrations, and they wanted to offer an alternative. 

In fact, on this and other issues, the first split of the Church eventually occurred, around 1054/1055 AD, when the Church split into the Eastern Church, which today is made of multiple branches called the Orthodox Church, and the Western Church, which became known as the Roman Catholic Church of today. (Some five hundred years later the Protestant movement, under the leadership of Martin Luther and others, split from the Western or Roman Catholic Church). 

Most churches in America today are descendants of the Western line of the Church and use a different calendar than the Eastern Orthodox churches. Sometimes our celebrations of Easter fall on the same day, and sometimes they vary by as much as five weeks! Based on these calculations, Easter can fall between March 22 and April 25, so this year is the second latest day on which Easter can fall. Easter last fell on April 25 in 1943 and will not do so again until 2038.

So, for the record, this year (2011) the first full moon following the vernal equinox occurred on April 18. Easter falls on the first Sunday following April 18, which is April 24. This year both the Western and Eastern churches are celebrating Easter on the same day. The beginning of Passover this year falls on April 19.

Believe me when I say the actual computations for Easter are actual quite involved. If you want to dig deeper, google Easter for more information. However, for most of us it's enough to take the word of "the powers that be" and celebrate Easter this year on April 24. Happy Easter!