Or you can just look it up in Google. How to determine the date for Easter.
From About.com:
Why does the date for Easter change every year? Have you ever wondered why Easter Sunday can fall anywhere between March 22 and April 25? And why do Eastern Orthodox churches celebrate Easter on a different day than Western churches? These are all good questions with answers that require a bit of explanation. In fact, there are as many misunderstandings about the calculation of Easter dates, as there are reasons for the confusion. What follows is an attempt to clear up at least some of the confusion.
In Western Christianity, Easter is always celebrated on the Sunday immediately following the Paschal Full Moon date of the year. I had previously, and somewhat erroneously stated, "Easter is always celebrated on the Sunday immediately following the first full moon after the vernal (spring) equinox." This statement was true prior to 325 AD; however, over the course of history (beginning in 325 AD with the Council of Nicea), the Western Church decided to established a more standardized system for determining the date of Easter.
In actuality, the date of the Paschal Full Moon is determined from historical tables, and has no correspondence to lunar events.
As Astronomers were able to approximate the dates of all the full moons in future years, the Western Christian Church used these calculations to establish a table of Ecclesiastical Full Moon dates. These dates would determine the Holy Days on the Ecclesiastical calendar.
Though modified slightly from its original form, by 1583 AD the table for determining the Ecclesiastical Full Moon dates was permanently established and has been used ever since to determine the date of Easter. Thus, according to the Ecclesiastical tables, the Paschal Full Moon is the first Ecclesiastical Full Moon date after March 20 (which happened to be the vernal equinox date in 325 AD). So, in Western Christianity, Easter is always celebrated on the Sunday immediately following the Paschal Full Moon.
The Paschal Full Moon can vary as much as two days from the date of the actual full moon, with dates ranging from March 21 to April 18. As a result, Easter dates can range from March 22 through April 25 in Western Christianity.
Historically, western churches used the Gregorian Calendar to calculate the date of Easter and Eastern Orthodox churches used the Julian Calendar. This was partly why the dates were seldom the same.
Easter and its related holidays do not fall on a fixed date in either the Gregorian or Julian calendars, making them movable holidays. The dates, instead, are based on a lunar calendar very similar to the Hebrew Calendar.
While some Eastern Orthodox Churches not only maintain the date of Easter based on the Julian Calendar which was in use during the First Ecumenical Council of Nicea in 325 AD, they also use the actual, astronomical full moon and the actual vernal equinox as observed along the meridian of Jerusalem. This complicates the matter, due to the inaccuracy of the Julian calendar, and the 13 days that have accrued since 325 AD. This means, in order to stay in line with the originally established (325 AD) vernal equinox, Orthodox Easter cannot be celebrated before April 3 (present day Gregorian calendar), which was March 21 in 325 AD.
Additionally, in keeping with the rule established by the First Ecumenical Council of Nicea, the Eastern Orthodox Church adhered to the tradition that Easter must always fall after the Jewish Passover, since the death, burial and Resurrection of Christ happened after the celebration of Passover. Eventually the Orthodox Church came up with an alternative to calculating Easter based on the Gregorian calendar and Passover, and developed a 19-year cycle, as opposed to the Western Church 84-year cycle.
Since the days of early church history, determining the precise date of Easter has been a matter for continued argument. For one, the followers of Christ neglected to record the exact date of Jesus’ resurrection. From then on the matter grew increasingly complex.
Easter Dates – Why Does the Date for Easter Change Every Year?
The Shroud of Turin may be the real burial cloth of Jesus. The carbon dating, once seemingly proving it was a medieval fake, is now widely thought of as suspect and meaningless. Even the famous Atheist Richard Dawkins admits it is controversial. Christopher Ramsey, the director of the Oxford Radiocarbon Laboratory, thinks more testing is needed. So do many other scientists and archeologists. This is because there are significant scientific and non-religious reasons to doubt the validity of the tests. Chemical analysis, all nicely peer-reviewed in scientific journals and subsequently confirmed by numerous chemists, shows that samples tested are chemically unlike the whole cloth. It was probably a mixture of older threads and newer threads woven into the cloth as part of a medieval repair. Recent robust statistical studies add weight to this theory. Philip Ball, the former physical science editor for Nature when the carbon dating results were published, recently wrote: “It’s fair to say that, despite the seemingly definitive tests in 1988, the status of the Shroud of Turin is murkier than ever.” If we wish to be scientific we must admit we do not know how old the cloth is. But if the newer thread is about half of what was tested – and some evidence suggests that – it is possible that the cloth is from the time of Christ.
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