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Gregorian calendar - Wikipedia, the free encyclopedia
The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was na...
en.wikipedia.org/wiki/Gregorian_calendar |
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Julian calendar - Wikipedia, the free encyclopedia
The Julian calendar , a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC (709 ab urbe condita ). It was chosen after consultation with the astro...
en.wikipedia.org/wiki/Julian_calendar |
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Two main versions of the Christian calendar have existed in recent times: The Julian calendar and the Gregorian calendar. The difference between them lies in the way they approximate the length of the tropical year and their rules for calculating Easter.
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The Gregorian Calendar starts at the presumed year of the birth of Jesus Christ. This Christian aspect of the Gregorian calendar (especially the use of Before Christ and Anno Domini) can be irritating, or even offensive, to non-Christian people.
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For example, in 2007, the Muslim holy month of Ramadan began on September 13 and runs through October 12. In 2006, Ramadan was September 24 through October 21. Each successive year, Ramadan starts about 11 or 12 days earlier in the Gregorian Calendar.
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The modern Gregorian calendar was introduced by Pope Gregory XIII, in 1582 AD, to replace the Julian calendar. This system is largely the Julian calendar with two changes. Firstly the leap year rule was changed so that centurial years (for instance: 1600, 1700, and 1800) must be evenly divisible by 400 to be leap years.
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