"The Christian holy day of Pentecost, which is celebrated on the seventh Sunday after Easter, 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 (Acts 2:1–31). In Christian tradition, this event represents the birth of the early Church. 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."
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