The Pope who established our modern calendar, and why we use it today - YouTube
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The time the pope made 10 days disappear
Today in History, February 24, 1582: Pope Gregory XIII outlined Gregorian calendar
On this day in 1582: Pope Gregory XIII announces the new Gregorian calendar
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Top 100 Global Creator - P93. Pope Gregory XIII: Creator of Gregorian calendar - Worldkings - World Records Union
Gregorian Calendar | Information School | University of Washington
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6 Things You May Not Know About the Gregorian Calendar | HISTORY
The Gregorian Calendar - Encyclopedia Virginia
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Papal calendar: 2023 holds important events for Pope Francis - Catholic Review
Commission for the calendar reformation, under Pope Gregory XIII (1502-1585) the Julian Calendar was..., Stock Photo, Picture And Rights Managed Image. Pic. AHV-AGC-F-002022-0000 | agefotostock
Pope_Gregory_XIII__who_gave_his_name_to_the_Gregorian_calendar..jpg
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Bell Schedule
United in prayer: Pope adds Coptic Orthodox martyrs to Catholic calendar | USCCB
Inter gravissimas - Wikipedia
