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The American Church Dictionary and Cycopedia
The word "calendar" is derived from the Latin word calo, meaning, to reckon. From this the first day of every Roman month was called Calends, hence Calendar. Calendars are known to have been in use at a very early date. One is still extant that was formed as early as A.D. 336, and another drawn up for the Church in Carthage dates from A.D. 483. The origin of Christian Calendars is clearly coeval with the commemoration of martyrs, which began at least as early as the martyrdom of Polycarp, A.D. 168. The Church Calendar is set forth in the introductory portion of the Prayer Book, consisting of several Tables giving the Holy Days of the Church with their Proper Lessons, and also the ordinary days of the year with the Daily Lessons. It is well to note that the Calendar as thus set forth is the detailed law of the Church for the daily Worship of God. There is so much stated and implied in this law it is well worth our careful study, and the reader is referred to this introductory portion of the Prayer Book. (See CHRISTIAN YEAR).
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Miller, William James. Entry for 'Calendar'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/c/calendar.html. 1901.