Holy Week by some parishes of the Roman Rite of the Catholic Church, of the Polish National Catholic Church, of Anglicanism, of other Protestant churches such as Lutheranism, and of Western Rite Orthodoxy within the Eastern Orthodox Church. In the Catholic Church, "tenebrae" is the name given to the celebration, with special ceremonies, of Matins and Lauds, the first two hours of the Liturgy of the Hours, of the last three days of Holy Week. Maundy Thursday (also known as Holy Thursday) commemorates the Last Supper, where Christ lays out the model for the Eucharist or Holy Communion. During the meal, Jesus
Days of week on Hebrew calendar the "four gates". Since three arrangements cannot occur within the fixed calendar, most holidays can each occur on one of four possible days. All the holy days and festivals fall in the months of Nisan through Tishrei, months one to seven. These months always have the same number of days, alternating 30 and 29. The next two months are Cheshvan and Kislev, months eight and nine. Both or either of these months can have either 29 or 30 days, allowing for adjustments to be made and the schedule in the coming year to be manipulated. (On a regular year, Cheshvan