Occurrence is the coinciding or occurring of two liturgical offices on one and the same day; concurrence is the succession of two offices, so that the second vespers of one occur at the same time as the first vespers of the other. The chief causes of occurrence are: (1) the variableness of the feast and cycle of Easter, while the other feasts are fixed; (2) the annual change of the Dominical Letter, whereby Sunday falls successively on different dates of the same month (see CALENDAR; DOMINICAL LETTER). Occurrence may be accidental or perpetual .
In case of an occurrence two questions arise: (1) Which office is to have the preference? (2) What is to be done concerning the less favoured office?
To give an instance of concurrence, the ecclesiastical calendar marks the feast of St. Anthony of Padua on 13 June, and that of St. Basil on 14 June; these two feasts being of double rite have first and second Vespers ; on the evening of 13 June, therefore, the second Vespers of St. Anthony and the first Vespers of St. Basil happen at the same time, and there is said to be a concurrence of the two offices.
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