For the civil calendar, the only substantive change was to omit 3 leap days every 400 years (in years evenly divisible by 100 but not 400, e.g., 1700, 1800, 1900, but not 2000). Considered as a theoretical calendar (i.e., projecting it back before it was actually invented), Easter and the Gregorian Reform...
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www.polysyllabic.com/?q=calhistory/gregorian
www.polysyllabic.com/?q=calhistory/gregorian
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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 This story, however, has no basis in actual fact. It is a fabrication, possibly invented by the English-French scholar Johannes de Sacrobosco in the 13th century.
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www.tondering.dk/claus/cal/node3.html
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Inventions question: Why was the Gregorian calendar invented? The Gregorian calendar, widely adopted in the western world, was initially decreed by Pope...
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wiki.answers.com/Q/Why_was_the_Gregorian_calendar_inven...
wiki.answers.com/Q/Why_was_the_Gregorian_calendar_invented
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What is gregorian? Gregorian calendar origin? Gregorian Calendar created by? What is the gregorian calender? Where was the calendar developed? Who invented
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wiki.answers.com/Q/Where_was_the_Gregorian_Calendar_Dev...
wiki.answers.com/Q/Where_was_the_Gregorian_Calendar_Developed
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It was way back in 1582 that the widely used Gregorian calendar was introduced (on February 24, actually). The Gregorian calendar was invented by an Italian...
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www.zimbio.com/Gregorian+calendar
www.zimbio.com/Gregorian+calendar
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The Gregorian calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named,
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en.wikipedia.org/wiki/Gregorian_calendar
en.wikipedia.org/wiki/Gregorian_calendar
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Three distinct types of calendars have resulted from this situation. A solar calendar, of which the Gregorian calendar in its civil usage is an example, is designed to maintain synchrony with the tropical year.
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astro.nmsu.edu/~lhuber/leaphist.html
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The Julian Day Count has nothing to do with the Julian Calendar introduced by Julius Caesar. It is named for Julius Scaliger, the father of Josephus Justus Scaliger, who invented the concept. It can also It is easy (with your calculator) to calculate the Julian Day Number of any date given on the Gregorian Calendar.
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quasar.as.utexas.edu/BillInfo/JulianDatesG.html
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However, four months of 31 days, seven months of 29 days, and one month of 28 days added up to only 355 days. Therefore the Romans invented an extra month called Mercedonius of 22 or 23 days. It was added every second year. Adoption of the Gregorian Calendar...
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www.infoplease.com/ipa/A0002061.html
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