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
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Pope Gregory XIII - Wikipedia
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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: Accomplishments & Legacy | Study.com
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Inter gravissimas - Wikipedia
Gregorian Calendar Pope Gregory XIII. - ppt video online download
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Top 100 Global Creator - P93. Pope Gregory XIII: Creator of Gregorian calendar - WCSA.WORLD
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April Fool's Day
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CatholicSaints.Info » Blog Archive » Pope Gregory XIII
Julian to Gregorian Calendar: How We Lost 10 Days
February 9, 1581 Pope Gregory XIII, Creator of the Gregorian Calendar: A Signed Letter from 1581 – Papal Artifacts
The Pope who established our modern calendar, and why we use it today - YouTube
