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The '''Gregorian calendar''' is the most widely used calendar in the world today.  It was first proposed by the Calabrian doctor [[Aloysius Lilius]], and decreed by [[Pope Gregory XIII]], after whom it was named, on 24 February 1582 by papal bull ''[[Inter gravissimas]]''.  It is a reform of the [[Julian calendar]].

The '''Gregorian calendar''' is the most widely used calendar in the world today.  It was first proposed by the Calabrian doctor [[Aloysius Lilius]], and decreed by [[Pope Gregory XIII]], after whom it was named, on 24 February 1582 by papal bull ''[[Inter gravissimas]]''.  It is a reform of the [[Julian calendar]].