John of Sacrobosco and the Calendar
Jennifer Moreton
"John of Sacrobosco and the Calendar." John was a thirteenth-century writer on quadrivial subjects who nowadays is remembered, if at all, for his treatise Sphere. His contemporaries, however, appear to have considered him primarily as computist, or calendar. This article attempts place in computistical tradition, process establish nature contribution calendar reform. Sacrobosco's treatise, De anni ratione, has generally been assumed be basic text liberal arts course medieval schools; but since some its content an advanced nature, both inaccurate unorthodox, this appears unlikely. It was, fact, modeled earlier schools with which it confused, comparison between two treatises shows. Finally, contemporaries credited having "divided time": reference adoption system time measurement using minutes seconds still use today.
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