we started using the christian calendar after 800.
we started using the christian calendar after 800.
when did we start using the christian calendar?
after 800
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the oldest calendar of saints of the church of rome was compiled in the mid-4th century, under pope julius i or pope liberius. it contained both pagan and christian festivals. the oldest extant manuscript of the early christian calendar is the so-called calendar of filocalus, produced in ad 354. a more extensive martyrology was compiled by jerome in the early 5th century. jean mabillon published a calendar of the church of carthage made in ca. ad 483. the anno domini epoch is introduced in the 6th century. extant calendars of the early medieval period are based on jerome's system of numbering of the years of the metonic cycle, later called the golden numbers. a carolingian-era calendar published by luc d'achery is entitled "incipit ordo solaris anni cum litteris a s. hieronymo superpositis, ad explorandum septimanae diem, et lunae aetatem investigandam in unoquoque die per xix annos." ("here begins the order of the solar year with the letters placed by saint jerome, for the purpose of finding the day of the week and the age of the moon for any day within [the cycle of] 19 years"). the leiden aratea, a carolingian copy (dated 816) of an astronomical treatise of germanicus, is an important source for the transmission of the ancient christian calendar to the medieval period.
history of calendars