Pentecost (Christianity) Pentecost (for both Eastern and Western Christians), also known as Whitsunday in some Western Churches, is the commemoration of the coming of the Holy Spirit upon the disciples of Jesus following His ascension (Acts 2:1-11). It comes 50 days after Easter.
Ascension (Easterna and Western Christians) Ascension is the anniversary of Jesus’ ascension into heaven and enthronement as universal sovereign. It comes 40 days after Easter/Pascha.
Easter or Pascha (Christianity) Easter for Western Christians, Pascha for Eastern Christians, celebrates the resurrection of Jesus. It initiates the fifty-day period culminating in Pentecost.
Holy (Good) Friday (Christianity) Holy Friday for Eastern Christians, Good Friday for Western Christians, commemorates the Passion of Jesus Christ, i.e. his submission to death by crucifixion.