A moveable feast or movable feast is an observance in a Christian liturgical calendar that occurs on a different date (relative to the dominant civil or solar calendar) in different years.
The most important set of moveable feasts are a fixed number of days before or after Easter Sunday, which varies by 35 days since it depends partly on the phase of the moon and must be computed each year. In Eastern Christianity (including the Eastern Orthodox Church, the Oriental Orthodox Churches, the Assyrian Church of the East, and the Eastern Catholic Churches), these moveable feasts form what is called the Paschal cycle, which stands in contrast to the approach taken by Catholic and Protestant Christianity.
Most other feast days, such as those of particular saints, are fixed feasts, held on the same date every year. However, some observances are always held on the same day of the week, and thus occur on a range of days without depending on the date of Easter. For example, the start of Advent is the Sunday nearest November 30. In addition, the observance of some fixed feasts may move a few days in a particular year to not clash with that year's date for a more important moveable feast. There are rare examples of saints with genuinely moveable feast days, such as Saint Sarkis the Warrior in the calendar of the Armenian Church.
Since Islamic feasts (Id ul Adha and Id ul Fitr) are lunar month based, they take place in different solar calendar dates and can occur at any time of the year.
Easter, also called Pascha or Resurrection Sunday, is a festival and holiday commemorating the resurrection of Jesus from the dead, described in the New Testament as having occurred on the third day after his burial following his crucifixion by the Romans at Calvary c. 30 AD. It is the culmination of the Passion of Jesus, preceded by Lent, a 40-day period of fasting, prayer, and penance.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
The Revised Julian calendar, also known as the Milanković calendar, or, less formally, new calendar, is a calendar proposed by the Serbian scientist Milutin Milanković in 1923, which effectively discontinued the 340 years of divergence between the naming of dates sanctioned by those Eastern Orthodox churches adopting it and the Gregorian calendar that has come to predominate worldwide. This calendar was intended to replace the ecclesiastical calendar based on the Julian calendar hitherto in use by all of the Eastern Orthodox Church. From 1 March 1600 through 28 February 2800, the Revised Julian calendar aligns its dates with the Gregorian calendar, which was proclaimed in 1582 by Pope Gregory XIII for adoption by the Christian world. The calendar has been adopted by the Orthodox churches of Constantinople, Albania, Alexandria, Antioch, Bulgaria, Cyprus, Greece, and Romania.
A reform of the date of Easter has been proposed several times because the current system for determining the date of Easter is seen as presenting two significant problems:
The liturgical year, also known as the church year or Christian year, as well as the kalendar, consists of the cycle of liturgical seasons in Christian churches that determines when feast days, including celebrations of saints, are to be observed, and which portions of Scripture are to be read either in an annual cycle or in a cycle of several years.
The Coptic calendar, also called the Alexandrian calendar, is a liturgical calendar used by the Coptic Orthodox Church and also used by the farming populace in Egypt. This calendar is based on the ancient Egyptian calendar. To avoid the calendar creep of the latter, a reform of the ancient Egyptian calendar was introduced at the time of Ptolemy III which consisted of the intercalation of a sixth epagomenal day every fourth year. However, this reform was opposed by the Egyptian priests, and the reform was not adopted until 25 BC, when the Roman Emperor Augustus imposed the Decree upon Egypt as its official calendar. To distinguish it from the Ancient Egyptian calendar, which remained in use by some astronomers until medieval times, this reformed calendar is known as the Coptic calendar. Its years and months coincide with those of the Ethiopian calendar but have different numbers and names.
Whit Monday or Pentecost Monday is the holiday celebrated the day after Pentecost, a moveable feast in the Christian calendar. It is moveable because it is determined by the date of Easter. In the Catholic Church, it is the Memorial of the Blessed Virgin Mary, Mother of the Church.
Septuagesima is the name for the ninth Sunday before Easter, the third before Ash Wednesday. The term is sometimes applied to the seventy days starting on Septuagesima Sunday and ending on the Saturday after Easter. Alternatively, the term is sometimes applied also to the period commonly called Shrovetide or Gesimatide that begins on this day and ends on Shrove Tuesday, the day before Ash Wednesday, when Lent begins.
Quartodecimanism refers to the custom of early Christians celebrating Passover beginning with the eve of the 14th day of Nisan.
The Byzantine Rite, also known as the Greek Rite or Constantinopolitan Rite, is the liturgical rite used by the Eastern Orthodox Church, the Greek Catholic Churches, and in a modified form, Byzantine Rite Lutheranism. Its development began during the fourth century in Constantinople and it is now the second most-used ecclesiastical rite in Christendom after the Roman Rite.
In the Christian liturgical calendar, there are several different Feasts of the Cross, all of which commemorate the cross used in the crucifixion of Jesus. While Good Friday is dedicated to the Passion of Christ and the Crucifixion, these days celebrate the cross itself, as the instrument of salvation. The most common day of commemoration is September 14 in Roman Catholicism and Eastern Orthodoxy.
The Feast of the Ascension of Jesus Christ, also called Ascension Day, Ascension Thursday, or sometimes Holy Thursday, commemorates the Christian belief of the bodily Ascension of Jesus into heaven. It is one of the ecumenical feasts of Christian churches, ranking with the feasts of the Passion, of Easter, and Pentecost. Ascension Day is traditionally celebrated on a Thursday, the fortieth day of Easter, although some Christian denominations have moved the observance to the following Sunday. In the Catholic Church in the United States, the day of observance varies by ecclesiastical province.
The Eastern Orthodox Liturgical Calendar describes and dictates the rhythm of the life of the Eastern Orthodox Church. Passages of Holy Scripture, saints and events for commemoration are associated with each date, as are many times special rules for fasting or feasting that correspond to the day of the week or time of year in relationship to the major feast days.
A synaxis is a liturgical assembly in Eastern Christianity, generally for the celebration of Vespers, Matins, Little Hours and the Divine Liturgy.
"Octave" has two senses in Christian liturgical usage. In the first sense, it is the eighth day after a feast, reckoning inclusively, and so always falls on the same day of the week as the feast itself. The word is derived from Latin octava (eighth), with dies (day) understood. In the second sense, the term is applied to the whole period of these eight days, during which certain major feasts came to be observed.
The Feast of the Annunciation, contemporarily the Solemnity of the Annunciation, also known as Lady Day, the Feast of the Incarnation, Conceptio Christi, commemorates the visit of the archangel Gabriel to the Virgin Mary, during which he informed her that she would be the mother of Jesus Christ, the Son of God. It is celebrated on 25 March each year. In the Roman Catholic Church, when 25 March falls during the Paschal Triduum, it is transferred forward to the first suitable day during Eastertide. In Eastern Orthodoxy and Eastern Catholicism, it is never transferred, even if it falls on Pascha (Easter). The concurrence of these two feasts is called Kyriopascha.
A liturgical book, or service book, is a book published by the authority of a church body that contains the text and directions for the liturgy of its official religious services.