Because on Pentecost, we celebrate the Coming Of the Holy Spirit, so on the following Sunday, we celebrate all 3 Divine Persons of the Holy Trinity.
Christians celebrate the Trinity all of the time. However, the Sunday after Pentecost is known as 'Trinity Sunday.'
Many Christians including Catholics celebrate the Easter liturgical season for 50 days from Easter Sunday to Pentecost.
Pentecost Sunday is considered the birthday of the Church.
No It falls after Easter and before Ttrinity Sunday
Catholicism had its beginning on Pentecost Sunday in about the year 33 AD.
Roman Catholic AnswerThe Sunday after Pentecost is Trinity Sunday.
Pentecost is on Sunday, May 23, 2010.
Roman Catholic AnswerThe Sunday after Pentecost is Trinity Sunday.
Sunday the 8th of June 2014 is Pentecost Sunday.
Easter Sunday celebrates the Resurrection of Jesus. The Celebration of Easter begins on "Good Friday" which commemorates the Crucifixion of Jesus on the Cross. The Day of Pentecost or "Pentecostal Sunday" is celebrated 50 days after the resurrection of Jesus (or Easter Sunday) Each year, Pentecost Sunday comes 50 days after Easter Sunday, hence its name. The Greek word for 50 is pentecost. The beginning of Pentecost is recorded in Acts 2:1-2.
Pentecost Sunday in 1965 fell on May 23. Pentecost is celebrated on the seventh Sunday after Easter, which is determined by the date of Easter Sunday. In 1965, Easter Sunday was on April 18, making the following Pentecost Sunday on May 23.