The Ordinary of the Mass (Latin: Ordo Missae) is the set of texts of the Roman Rite Mass that are generally invariable. This contrasts with the proper, which are items of the Mass that change with the feast or following the Liturgical Year. The Ordinary is printed in the Roman Missal as a distinct section placed in the middle of the book, between the Mass of the Easter Vigil and that of Easter Sunday in pre-1970 editions, and between the Proper of the Seasons and the Proper of the Saints thereafter.