another name for Ascension Day. William Blake's poem "Holy Thursday" refers to Ascension Day; Thomas Pruen used the term to refer to Ascension Day in his Illustration of the Liturgy of the Church of England, published in 1820; however use of the term "Holy Thursday" to mean Ascension Day is rare, and the term is more generally applied by most Christian denominations to Maundy Thursday in Holy Week. In Western Christianity, the earliest possible date is April 30 (as in 1818 and 2285), the latest possible date is June 3 (as in 1943 and 2038). In Roman Catholicism, the Ascension of the Lord is ranked as a Solemnity and is a Holy Day of Obligation. In the Anglican Communion, Ascension Day is a Principal Feast. The three days before Ascension Thursday are sometimes referred to as the Rogation days, and the previous Sunday—the Sixth Sunday of Easter (or the Fifth Sunday Easter)—as Rogation Sunday. Ascension has a vigil and, since the 15th century, an octave, which is set apart for a novena of preparation for Pentecost. In traditional Methodist usage, The Book of Worship for Church and Home (1965) provides the following Collect for Ascension Day, commonly called Holy Thursday: Sunday observance Roman Catholic parishes in a number of countries that do not observe the feast as a public holiday have obtained permission from the Vatican to move observance of the Feast of the Ascension from the traditional Thursday to the following Sunday, the Sunday before Pentecost. Similarly, the United Methodist Church allows the traditional celebration on Holy Thursday to be moved to Sunday. This is in keeping with a trend to move Holy Days of Obligation from weekdays to Sunday, to encourage more Christians to observe feasts considered important. The decision to move a feast is made by each Conference of Catholic Bishops with prior approval of the Apostolic See. In some cases the Conference may delegate the determination for specific feasts to the bishops of an ecclesiastical province within the conference, i.e. an archbishop and the neighbouring bishops. The switch to Sunday was made in 1992 by the church in Australia; before 1996 in parts of Europe; in 1997 in Ireland; before 1998 in Canada and parts of the western United States; in many other parts in the United States from 1999; and in England and Wales from 2007 to 2017, but in 2018 reinstated to Thursday. In