: the calendar system that is used by most people in the world today
Note: The Gregorian calendar was introduced in 1582 by Pope Gregory XIII. It is now used throughout the world for legal and business purposes.
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“Gregorian calendar.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/Gregorian%20calendar. Accessed 18 Apr. 2026.
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