Sums up all the observances in the Church's calendar from Advent up until Pentecost. On Trinity Sunday, the Church is reminded of God's eternal nature - they remember that they worship one God in three persons (Father, Son and the Holy Spirit)
eighth Sunday after Easter
the Sunday after Pentecost, and the day on which the communion of God as the Father, Son and Holy Spirit is celebrated.
The first Sunday after Pentecost, acknowledging the mystery and unity of the Holy Trinity (God the father, His Son Jesus Christ, and the Holy Spirit)
The first Sunday after the Pentecost and the only major Holy Day named for a doctrine. Until recently, Sundays were dated after Trinity, a custom believed to have grown in popularity due to St. Thomas Becket, Archbishop of Canterbury.
A principal feast of the Church, honouring the Trinity, observed on the Sunday next after Whitsunday. This is the Feast Day of the Cathedral of the Holy Trinity.
Trinity Sunday is the first Sunday after Pentecost in the Western Christian liturgical calendar. Trinity Sunday celebrates the Christian doctrine of the Trinity, the three persons of God: the Father, Son, and Holy Spirit. Trinity Sunday is the first Sunday in the second period of Ordinary Time, a period which continues until Advent and is characterised by the use of green as the predominant liturgical colour; however, the colour for Trinity Sunday itself is white.