Roman Breviary in the context of "Ecclesiastical Latin"

Latin liturgical rites, or Western liturgical rites, is a large family of liturgical rites and uses of public worship employed by the Latin Church, the largest particular church sui iuris of the Catholic Church, that originated in Europe where the Latin language once dominated and further by Western Rite Orthodoxy and Independent and Old Catholicism. Its language is now known as Ecclesiastical Latin. The most used rite is the Roman Rite.

The Latin rites were for many centuries no less numerous than the modern Eastern Catholic liturgical rites. The number of Latin rites and uses is now much reduced. In the aftermath of the Council of Trent, in 1568 and 1570 Pope Pius V suppressed the breviaries and missals that could not be shown to have an antiquity of at least two centuries in favor of the Roman Missal and Roman Breviary. Many local rites that remained legitimate even after this decree were abandoned voluntarily, especially in the 19th century, in favor of the Tridentine Mass and other Roman Rite rituals. In the second half of the 20th century, most of the religious orders that had a distinct liturgical rite chose to adopt in its place the Roman Rite as revised in accordance with the decrees of the Second Vatican Council (see Mass of Paul VI). A few such liturgical rites persist today for the celebration of Mass, since 1965–1970 in revised forms, but the distinct liturgical rites for celebrating the other sacraments have been almost completely abandoned.

The Liturgy of the Hours (Latin: Liturgia Horarum), Divine Office (Latin: Divinum Officium), or Opus Dei ("Work of God") is a set of Catholic prayers comprising the canonical hours, often also referred to as the breviary, of the Latin Church. The Liturgy of the Hours forms the official set of prayers "marking the hours of each day and sanctifying the day with prayer." The term "Liturgy of the Hours" has been retroactively applied to the practices of saying the canonical hours in both the Christian East and West–particularly within the Latin liturgical rites–prior to the Second Vatican Council, and is the official term for the canonical hours promulgated for usage by the Latin Church in 1971. Before 1971, the official form for the Latin Church was the Breviarium Romanum, first published in 1568 with major editions through 1962.

The Liturgy of the Hours, like many other forms of the canonical hours, consists primarily of psalms supplemented by hymns, readings, and other prayers and antiphons prayed at fixed prayer times. Together with the Mass, it constitutes the public prayer of the church. Christians of both Western and Eastern traditions (including the Latin Catholic, Eastern Catholic, Eastern Orthodox, Oriental Orthodox, Assyrian, Lutheran, Anglican, and some other Protestant churches) celebrate the canonical hours in various forms and under various names. The chant or recitation of the Divine Office therefore forms the basis of prayer within the consecrated life, with some of the monastic or mendicant orders producing their own permutations of the Liturgy of the Hours and older Roman Breviary.

A breviary (Latin: breviarium) is a liturgical book used in Christianity for praying the canonical hours, usually recited at seven fixed prayer times.

Historically, different breviaries were used in the various parts of Christendom, such as Aberdeen Breviary, Belleville Breviary, Stowe Breviary and Isabella Breviary, although eventually the Roman Breviary became the standard within the Roman Catholic Church (though it was later supplanted with the Liturgy of the Hours); in other Christian denominations such as the Lutheran Churches, different breviaries continue to be used, such as The Brotherhood Prayer Book.

An ecclesiastical full moon is formally the 14th day of the ecclesiastical lunar month (an ecclesiastical moon) in an ecclesiastical lunar calendar. The ecclesiastical lunar calendar spans the year with lunar months of 30 and 29 days which are intended to approximate the observed phases of the Moon. Since a true synodic month has a length that can vary from about 29.27 to 29.83 days, the moment of astronomical opposition tends to be roughly 14.75 days after the previous conjunction of the Sun and Moon (the new moon). The ecclesiastical full moons of the Gregorian lunar calendar tend to agree with the dates of astronomical opposition, referred to a day beginning at midnight at 0 degrees longitude, to within a day or so. However, the astronomical opposition happens at a single moment for the entire Earth: The hour and day at which the opposition is measured as having taken place will vary with longitude. In the ecclesiastical calendar, the 14th day of the lunar month, reckoned in local time, is considered the day of the full moon at each longitude.

Beginning in mediaeval times, the age of the ecclesiastical moon was announced daily at the canonical hour of Prime during the reading of the martyrology. This is still done today by those using the extraordinary form of the Roman Rite, (according to the 1962 Roman Breviary).

The Nova Vulgata (complete title: Nova Vulgata Bibliorum Sacrorum Editio, transl. The New Vulgate Edition of the Holy Bible; abr. NV), also called the Neo-Vulgate, is the Catholic Church's official Latin translation of the original-language texts of the Catholic canon of the Bible published by the Holy See. It was completed in 1979, and was promulgated the same year by John Paul II in Scripturarum thesaurus. A second, revised edition was published in 1986. It is the official Latin text of the Bible of the Catholic Church. The Nova Vulgata is also called the New Latin Vulgate or the New Vulgate.

Before the Nova Vulgata, the Clementine Vulgate was the standard Bible of the Catholic Church. The Clementine version continues to be employed in liturgical celebrations using the pre–Vatican II liturgical books, including the 1961 Roman Breviary.