In an article in The Christian Century, history professor Steve Ware asks the question, "When Is Easter this year?" For those of you who didn't learn this in confirmation class, the date of Easter corresponds to the first Sunday after the first full moon after the vernal equinox. Seriously.

In his article, Ware explains how this came to be. Here's the short version of the story: In 325 A.D., Constantine, emperor of the Holy Roman Empire, convened the Council of Nicea. Among the business before the council was to establish a uniform date for Easter. Out of the discussion and debate came the "Easter Rule," setting Easter, as I said, on the first Sunday after the first full moon after the vernal equinox. As is often the case with church councils, the decision was not unanimous. The Eastern bishops 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 preferred a date corresponding with the beginning of spring, because that was the time already established for a lot of pagan celebrations, and they figured to capitalize on the momentum. This is why, to this day, we have such things as the Easter Bunny and colored eggs associated with Easter. Well, on this, and other issues, the church eventually split. To this day, we, who are descendants of the Western line of Christendom, use a different calendar than the Eastern Orthodox churches. Sometimes our celebration of Easter falls on the same day, and sometimes it varies by as much as five weeks!