How to determine the number of Trinity
The Orthodox church calendar isthe schedule on which the church lives, worship services are performed, and fasting begins. In the Church there are twelve major holidays, which are called: Twelve. And the feast of the Trinity is one of them. Easter is considered the main Orthodox holiday, it is not even among the twelve. Easter is a "holiday festival" - an event that determines the church life for a good third of the year. And the date of several twelve holidays, including the Trinity, can be determined precisely by Easter.
Easter is a passing holiday, that is, every year it happens at different times. The date of Easter is difficult to calculate, and the timing of the onset of a number of important events depends on it.
Before Easter, Christians all over the world have a fast. The Orthodox have this Great Lent, which begins seven weeks before the Bright Resurrection of Christ. Before Lent there are several special weeks for preparation: a week about Zacchaeus, a week with reading about Mytar and the Pharisee, a week dedicated to the prodigal son, a week about the Last Judgment (she is Maslenitsa).
That is, the preparation for Easter begins in 13weeks. After Easter, there is a series of holidays that are associated with it. This is Fomin's week, and the week of the Myrrh-Bearing Women, Ascension, Trinity. What is the number of the Trinity in a particular year, depends on the number of Easter falls.
The Trinity is on the fiftieth day after Easter, therefore it is called Pentecost.
One week after the feast of Pentecost, Petrov's fast begins. It ends always on July 12, the day of the holy apostles of the high-ranking Peter and Paul.
Any post imposes significant restrictionson all who follow it. The Great Lent assumes not only the refusal of fast food, but also the restriction of entertainment, frequent visits to worship services. Some do not watch TV in the post, do not go to the theater and visit. Life in the post is radically changing, so the Orthodox will learn with great interest the date of Easter for the next year or the number of the Trinity. For example, the Trinity 2013 of the year? We need to open Easter eggs and find out that Easter in 2013 is very late, and the Trinity falls on June 23rd. This means that Lent this year will start late, and indeed, the beginning of the post fell on March 15. All calmly and without worry noted on March 8, and Easter fell on the May holidays, which is also very convenient. Petrov's post was short, only two weeks.
Some are surprised that the Orthodoxuse such an uncertain, each time a different calendar. But aside from theological justifications, there are other positive moments for such an "instability." Each year is different, one is not like the other, and it's not bad.