Holy Eucharist, Rite II
Trinity Sunday is unique in that it celebrates a Doctrine of the Church rather than an individual or event (or a season related to an event).
The Holy Trinity of Father, Son, and Holy Spirit is central to orthodox Christianity. As Episcopalians/Anglicans, we agree that the Ancient Creeds of the Church (The Apostle's Creed, which is used at Baptism, and the Nicene Creed, which is used at the Eucharist) are sufficient statements of our common faith. Both are centered upon the Holy Trinity.
The ancient Athenasian Creed (BCP p.864) provides an exhaustive statement of how the three persons of the Holy Trinity are to be understood.
Readings for Trinity Sunday, Year B
Psalm 29 | Canticle 13