Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The General Roman Calendar indicates the days of the year to which are assigned the liturgical celebrations of saints and of the mysteries of the Lord that are to be observed wherever the Roman Rite is used. National and diocesan liturgical calendars, as well as those of religious orders and even of continents, add other saints or transfer the celebration of a particular saint from the date assigned in the General Calendar to another date. These liturgical calendars also indicate the degree or rank of each celebration: Optional Memorial, Obligatory Memorial, Feast or Solemnity. Among other differences, the Gloria is said or sung at the mass of a Feast, but not at that of a Memorial, and the Creed is added on Solemnities.

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