Maundy Thursday (also known as Holy Thursday, Covenant Thursday, Great and Holy Thursday, Sheer Thursday and Thursday of Mysteries) is the Christian feast, or holy day, falling on the Thursday before Easter. It commemorates the Maundy and Last Supper of Jesus Christ with the Apostles as described in the Canonical gospels.^[1] It is the fifth day of Holy Week, and is preceded by Spy Wednesday and followed by Good Friday.^[2]

The date is always between 19 March and 22 April inclusive, but these dates fall on different days depending on whether the Gregorian or Julian calendar is used liturgically. Eastern churches generally use the Julian calendar, and so celebrate this feast throughout the 21st century between 1 April and 5 May in the more commonly used Gregorian calendar. The liturgy held on the evening of Maundy Thursday initiates the Easter Triduum, the period which commemorates the passion, death, and resurrection of Christ; this period includes Good Friday, Holy Saturday, and ends on the evening of Easter.^[3][1] The mass or service of worship is normally celebrated in the evening, when Friday begins according to Jewish tradition, as the Last Supper was held on feast of Passover.^[4]

Unity Day may refer to:

Great Lent, or the Great Fast, is the most important fasting season in the church year in Eastern Christianity, which prepares Christians for the greatest feast of the church year, Pascha (Easter). In many ways Great Lent is similar to Lent in Western Christianity. There are some differences in the timing of Lent (besides calculating the date of Easter) and how it is practiced, both liturgically in the public worship of the church and individually.

One difference between Eastern Christianity and Western Christianity is the calculation of the date of Easter (see Computus). Most years, the Eastern Pascha falls after the Western Easter, and it may be as much as five weeks later; occasionally, the two dates coincide. Like Western Lent, Great Lent itself lasts for forty days, but unlike the West, Sundays are included in the count. Great Lent officially begins on Clean Monday, seven weeks before Pascha (Ash Wednesday is not observed in Eastern Christianity) and runs for 40 contiguous days, concluding with the Presanctified Liturgy on Friday of the Sixth Week. The next day is called Lazarus Saturday, the day before Palm Sunday. However, fasting continues throughout the following week, known as Passion Week or Holy Week, and does not end until after the Paschal Vigil early in the morning of Pascha (Easter Sunday).

April 6 (Western)

Good Friday (from the senses pious, holy of the word "good"),^[1] is a religious holiday observed primarily by Christians commemorating the crucifixion of Jesus Christ and his death at Calvary. The holiday is observed during Holy Week as part of the Paschal Triduum on the Friday preceding Easter Sunday, and may coincide with the Jewish observance of Passover. It is also known as Holy Friday, Great Friday, Black Friday,^[2] or Easter Friday,^[3] though the latter properly refers to the Friday in Easter week.