What is the Gregorian Calendar? (with pictures)
February 9, 1581 Pope Gregory XIII, Creator of the Gregorian Calendar: A Signed Letter from 1581 – Papal Artifacts
April Fool's Day
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My Catholic Faith - 😇Pope Gregory XIII 👉Pope Gregory XIII (Latin: Gregorius XIII; 7 January 1502 – 10 April 1585), born Ugo Boncompagni, was head of the Catholic Church and ruler of
File:Pope Gregory XIII (Ugo Buoncompagni, 1502–1585, pope 1572), Promulger of the Gregorian Calendar MET 13987.jpg - Wikimedia Commons
Catholics at Work - DID YOU KNOW: Pope Gregory XIII ordered to standardized the calendar because Julian calendar did not properly reflect the actual days the Earth takes to circle once around
6 Things You May Not Know About the Gregorian Calendar - HISTORY
The Pope who established our modern calendar, and why we use it today - YouTube
Today in History, February 24, 1582: Pope Gregory XIII outlined Gregorian calendar
CatholicSaints.Info » Blog Archive » Pope Gregory XIII
Julian to Gregorian Calendar: How We Lost 10 Days
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The Dragon and the Calendar - Pope Gregory XIII
Satanic origin of the Gregorian Calendar
Inter gravissimas - Wikipedia
Pope Gregory XIII creates the Gregorian Calendar – Historical articles and illustrationsHistorical articles and illustrations | Look and Learn
Pope Gregory XIII - Wikipedia
Twitter 上的EHS："#OTD in history the Gregorian Calendar was introduced by Pope Gregory XIII... Did you know yesterday was the 4 October?!... back in 1582, that is. #churchhistory #religioushistory https://t.co/onqGvEoNux" / Twitter
Pope Gregory XIII 1582: Gregorian Calender - 10 Events that Changed America
