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en.wikipedia.org/wiki/Adoption_of_the_Gregorian_calendar

The adoption of the Gregorian Calendar was an event in the modern history of most nations ... at the bottom that it was signed with papal authorization and by Lilio (Con licentia delli Superiori... et permissu Ant(onii) Lilij). ..... Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.

en.wikipedia.org/wiki/Julian_calendar

The Julian calendar, proposed by Julius Caesar in 46 BC (708 AUC), was a reform of the ... The Gregorian calendar has the same months and month lengths as the ..... was followed by the last five days of February, i.e., a.d. VI, V, IV, III and prid. ...... Jump up ^ A. Degrassi, Inscriptiones Italiae XIII: Fasti et Elogia 2: Fasti Anni ...

www.genealogyintime.com/GenealogyResources/Articles/understanding_julian_calendars_and_gregorian_calendars_in_genealogy_page1.html

The difference between the Julian and Gregorian calendars.