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Historical versions of the Divinum Officium

• The pre Tridentine Monastic version is an attempt to illustrate the Benedictine Breviary, as it is described in the Regula of St Benedict, with the exception that for lack of resources only 9 lessons are included for Sundays and Feasts instead of 12 lesson See details below
  
  
• The version ordered after the Council of Trent, by Pope St. Pius V, which except for the ever increasing number of feasts in the Proprium Sanctorum was unchanged until the 20th Century. This Tridentine version was based on the many centuries before printed books, therefore the majority of psalms were prayed in Mattins, Lauds, and Vespers. The little hours contained the same psalm 118 everyday, which was memorized by heart and could be prayed without a book, at the little hours. Sunday Matutinum contained 18 psalms, and the weekday mattins contained 12 psalms. Lauds and Vespers were considerably longer, due to the length of of the psalm and their suffragia. The Feasts of Saints offered some relief in the number of psalms. Those Mattins consisted of 9 psalms only which broke the rule of the required 150 psalms a week. The number of Festive Offices came to exceed the number of ferial Sunday Offices, when more than two thirds of the days were Festive Offices.
  
  The Trident 1570 version uses the original 1570 calendar, the Trident 1910 version uses the permanent calendar from the 1888 Pustet edition Hiemalis volume. The two differ only in the calendars, both uses the Clementine psalter and hymns, as well as the same rubrics. See details below
  
  
• The Divino Afflatu version is named from the Encyclical of St. Pius X., and was the Official version from 1911 to 1960. St Pius X. mixed two changes
  • The version uses the ferial psalms for the festive offices except for the 1st and 2nd class feasts, and for a few others which antiphons hand down for a feast. The Trindent version Sesonal mode is an attempt to show the effect of this change without the change of the Psalter
  • Also psalms are divided into a weekly cycle without significant repetion of the psalms (9 psalms for matins, 5 each for the major hours, 3 each for the minor hours). The encyclical also shortened significantly the suffragia, and other parts of the office, reducing the time at prayer about 20%.
  
  The Divino Afflatu version uses the permanent Kalendar from the printed 1943 Ratisbone Pustet edition Hiemalis volume. Missing offices are updated as sources allows.
  
  
• The version Reduced 1955 based on Cum Nostra Hac aetate decree, and the version Rubrics 1960 ordered by the Motu Proprio Rubricarum Instructum 1960 of John XXIII. furter shortened the prayer time by and additional 5% and 15% respectively.
  
  Both versions are using the permanent calendar from David Siefker's Lulu Breviary. Missing offices are updated as sources allows.
  See details below
  
  The 1960 New Calendar version implements the 2009 permanent calendar. It uses the 1960 rubrics, which is now the extraordinary form of the office. It is an experiment of the idea, that this form should be living prayer of the Church.
  See details below