Pentecost. The Christian holy day of Pentecost, which is celebrated fifty days after Easter Sunday, commemorates the descent of the Holy Spirit upon the Apostles and other followers of Jesus Christ while they were in Jerusalem celebrating the Feast of Weeks, as described in the Acts of the Apostles.
   The holy day is also called White Sunday or Whitsunday or Whitsun, especially in the United Kingdom, where traditionally the next day, Whit Monday, was also a public holiday. In Germany Pentecost is called Pfingsten and often coincides with scholastic holidays and the beginning of many outdoor and springtime activities, such as festivals and organized outdoor activities by youth organizations.
   The Monday after Pentecost is a legal holiday in many European nations. In Eastern Christianity, Pentecost can also refer to the entire fifty days of Easter through Pentecost inclusive; hence the book containing the liturgical texts is called the Pentecostarion.
   Since its date depends on the date of Easter, Pentecost is a moveable feast. Pentecost is one of the Great Feasts of the Eastern Orthodox Church, a Solemnity in the Roman Rite of the Catholic Church, a Festival in the Lutheran Churches, and a Principal Feast in the Anglican Communion.
   Many Christian denominations provide a special liturgy for this holy celebration. The term Pentecost comes from the Greek meaning fiftieth. It refers to the festiva
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