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In Russia, the calendar was originally called the "debt book". The days of the calendar, their names were reminiscent of the debt of memory, the debt of honor and tradition. A calendar is not only a calculation of time, it is also an event in the life of each individual person. In Christian countries in 325 AD. The Julian calendar was adopted, which is still used by the Russian Orthodox Church. In the history of chronology, the Julian calendar (old style) was replaced by the Gregorian (new style). The reform of the calendar was carried out in 1582. The date of calculation of Easter was the basis. Currently, there are various types of calendars: church, phenological, astrological, oriental, hunter's, fisherman's, mushroom picker's and others. This edition is a universal calendar (1994-2000). It is designed for the widest audience. The calendar is suitable for both adults and schoolchildren, and for family reading. About all this and not only in the book Russian House. Universal set of calendars