After the Second Vatican Council of 1962–1965, the Holy See, even before producing an actual lectionary (in Latin), promulgated the "Ordo Lectionum Missae" (Order of the Readings for Mass), giving indications of the revised structure and the references to the passages chosen for inclusion in the new official lectionary of the Roman Rite of Mass. It introduced an arrangement by which the readings on Sundays and on some principal feasts recur in a three-year cycle, with four passages from Scripture (including one from the Psalms) being used in each celebration, while on weekdays only three passages (again including one from the Psalms) are used, with the first reading and the psalm recurring in a two-year cycle, while the Gospel reading recurs after a single year. This revised Mass Lectionary, covering much more of the Bible than the readings in the Tridentine Roman Missal, which recurred after a single year, has been translated into the many languages in which the Roman Rite Mass is now celebrated, incorporating existing or specially prepared translations of the Bible and with readings for national celebrations added either as an appendix or, in some cases, incorporated into the main part of the lectionary.