Following Whitsun Week is Trinity Sunday, emphasizing the three-fold nature of God. Hymns and anthems which dwell upon any one Person of the Trinity are not appropriate.
The rest of the Sundays on the church year are known as Sundays after Trinity. Music may be of a general nature, although a continued study of the lessons, collects, epistles and gospels will result in a better selection of appropriate hymns and anthems.
The number of Sundays after Trinity depends upon the day of Easter. If Easter is early, there may be as many as twenty-seven Sundays after Trinity; if late, there may be as few as twenty-two. All Prayer Books provide lessons for twenty-seven Sundays after Trinity, but collects, epistles and gospels for only twenty-five. Since a long Trinity season can occur only when there has been a short Epiphany season, the collects, epistles and gospels which were omitted during Epiphany are used on Sundays after Trinity for which none are provided.
The rubrics after the collect, epistle and gospel for the Twenty-Fifth Sunday after Trinity in the English book, after those of the Sunday before Advent in the Canadian book, and after those of the Twenty-Fourth Sunday after Trinity in the American book explain clearly the use of Epiphany-tide collects, epistles and gospels during a long Trinity season.
During the Trinity season occur three more Ember Days: the Wednesday, Friday and Saturday after September 14. The English church uses the collect, epistle and gospel of the preceding Sunday; the Canadian and American churches, the collect, epistle and gospel appointed for all Ember Days.