Pope Gregory XIII (1572–1585) – Introduced the Gregorian calendar, still used worldwide today.
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Pope Gregory XIII (1572–1585) – Introduced the Gregorian calendar, still used worldwide today.
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Gregory XIII | Biography, Gregorian Calendar, Pope, Dragon, & Facts | Britannica
Gregory XIII | Biography, Gregorian Calendar, Pope, Dragon, & Facts | Britannica
Jun 15, 2015
britannica.com
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Explaining The Bible on Instagram: "The Gregorian calendar was introduced by Pope Gregory XIII in AD 1582 through the papal bull Inter gravissimas. It was not invented from scratch but reformed the existing Julian calendar (established by Julius Caesar in 46 BC), based primarily on calculations by Italian physician and astronomer Aloysius Lilius (Luigi Lilio), with refinements by Jesuit mathematician Christopher Clavius and a commission of scholars. The key change adjusted the leap-year rule: ev
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