Steve Berry - On October 15, 1582, Pope Gregory XIII introduced the Gregorian calendar. It was a refinement to the Julian calendar first implemented by Julius Caesar in 46 B.C. The Julian
What Calendar Do We Use? | About the Gregorian Calendar
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Gregorian calendar - Wikipedia
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Use of Gregorian calendar begins | OUPblog
Calendars and Dating
What is Time? The Gregorian Calendar
When Did the Gregorian Calendar Start in Each Country?
Understanding the Gregorian and Julian Calendars for Genealogy | The Genealogy Reporter
Julian & Gregorian Calendar Systems | Overview & Differences - Lesson | Study.com
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Gregorian Calendar
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File:Julian to Gregorian Date Change.png - Wikipedia
Episode 236: The Gregorian Calendar – Half-Arsed History
How many different Gregorian calendars are there? I'm assuming 14, one for Jan 1 starting on each weekday plus another seven for the leap years. - Quora
18 Gregorian Calendar Facts You Need to Know - Calendar
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Understanding Julian Calendars and Gregorian Calendars in Genealogy (page 4)
From the Julian to the Gregorian calendar
