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  1. — 45 BCE: Reforms made to the Roman calendar under Julius Caesar create the Julian Calendar, with 365 days in a year divided into 12 months and a leap year every four years (Italy) — 1582: Due to inaccuracies resulting from the Julian Calendar, Pope Gregory XIII issues the Gregorian Calendar, which reduces the number of leap years (Italy) 16.

  2. Sep 26, 2022 · Date (A.D.) Events & People; 1 AD: Unfortunately, since the scholars designing the new calendar didn't have the concept of zero, the new Gregorian calendar is calculated to start at year 1, so we go directly from December 31, 1 BC to January 1, 1 AD thereby making all the easy calculations of date intervals off by one.

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