Pentecost meaning "the 50th day" in Greek), also called Whitsun, Whitsunday, or Whit Sunday in the United Kingdom and other English-speaking areas, is a holiday and season in the Christian liturgical year. It is the 50th day after Easter (and the 10th day after Ascension Thursday). It is to remember the coming of the Holy Spirit to the Apostles and other followers of Jesus as described in the book of Acts in the Bible, as Jesus had promised after he rose from the dead. About 3,000 people were baptized that day, which to many, makes it the real start of the Christian Church.