Editing Liturgical year (section)

====Pascha====
{{Main|Easter|l1=Pascha}}
The greatest feast is Pascha. Easter for both East and West is calculated as the first Sunday after the [[full moon]] that falls on or after March 21 (nominally the day of the [[March equinox|vernal equinox]]), but the Orthodox calculations are based on the [[Julian calendar]], whose March 21 corresponds at present with April 3 of the [[Gregorian calendar]], and on calculations of the date of full moon different from those used in the West (see [[computus]] for further details).

The date of Pascha is central to the entire ecclesiastical year, determining not only the date for the beginning of Great Lent and Pentecost, but affecting the cycle of [[moveable feast]]s, of scriptural readings and the [[Octoechos (liturgy)|Octoechos]] (texts chanted according to the eight ecclesiastical modes) throughout the year. There are also a number of lesser feasts throughout the year that are based upon the date of Pascha. The moveable cycle begins on the [[Zacchaeus]] Sunday (the first Sunday in preparation for Great Lent or the 33rd Sunday after Pentecost as it is known), though the cycle of the Octoechos continues until Palm Sunday.

The date of Pascha affects the following liturgical seasons:
*The period of the [[Triodion]] (the Sundays before Great Lent, [[Cheesefare Week]], Palm Sunday, and Holy Week)
*The period of the [[Pentecostarion]] (Sunday of Pascha through the Sunday After Pentecost which is also called the Sunday of all saints)