The calendar introduced by Pope Gregory XIII is now the most widely
used civil calendar in the world. The older calendar introduced by
Julius Caesar in 45 B.C. underestimated the length of the year by
about 11 minutes. As centuries passed, the accumulated error grew.
By the late 1500s the Julian calendar was behind by twelve days.
Set amid the backdrop of the Reformation and the Renaissance, a
time of great schism in the Christian world, the story of the
calendar reform is an intriguing one. A central part concerns the
antagonistic relationship between two of the great intellectual
figures of the 16th century: the pro-reform mathematician
Christopher Clavius and the anti-reform literary scholar Joseph
Scaliger. In this book, the author provides an accessible
mathematical description of the old and new calendars as well as a
detailed discussion of the historical context for, and the main
players involved in the calendar reform.
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