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Concept
Gregorian Calendar
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Summary
The
Gregorian calendar
is the internationally accepted
civil calendar
introduced by
Pope Gregory XIII
in 1582 to reform the
Julian calendar
, primarily to correct the
drift of the equinoxes
. It achieves greater accuracy by introducing a system of
leap years
that omits three
leap days
every 400 years, ensuring that the
average year length
closely aligns with the
Earth's orbit
around the Sun.
Concepts
ISO 8601
Date-Time Conversion
Leap Year Calculation
Julian Calendar
Roman Calendar
Solar Calendar
Islamic Calendar
Islamic Chronology
Timekeeping And Calendars
Date And Time Notation
Date And Time Formats
Calendrical Systems
Calendar Reform
Calendar Calibration
Orthodox Church Calendar
Calendar Date
Leap Year
Astronomical Timekeeping
Tropical Year
Calendrical Calculations
Solar Year
Date And Time Formatting
Calendar Year
Hijri Year
Civil Timekeeping
Date Format
Calendar System
Date And Time Representation
Calendar Systems
Week Date
Relevant Degrees
Prehistory 67%
History of Civilization 33%
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