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1. theconversation.com › pope-gregory-xiii-gave-usPope Gregory XIII gave us the leap year – but his legacy goes ...

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   Feb 28, 2024 · On this day, February 29, conversations the world over may conjure the name of Pope Gregory XIII – widely known for his reform of the calendar that bears his name. The need for calendar reform ...

2. www.britannica.com › story › ten-days-that-vanishedTen Days That Vanished: The Switch to the Gregorian Calendar

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   The Protestant regions of Germany and the Netherlands switched in the 17th century. Great Britain and the territories of the British Empire followed suit in 1752, spreading the Gregorian calendar around the globe. In 1582 Pope Gregory XIII introduced a more accurate calendar. But switching over wasn’t easy.

   • Author: The Editors of Encyclopaedia Britannica

3. historyguild.org › pope-gregory-xiii-gave-us-thePope Gregory XIII gave us the leap year - History Guild

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   An oil painting showing discussions of the reform of the calendar under Pope Gregory XIII. Wikimedia. To correct this, Gregory convened a commission of experts. Their work led to the publication of a formal papal decree in the form of the bull Inter Gravissimas on February 24 1582.

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5. www.insights.uca.org.au › pope-gregory-xiii-gavePope Gregory XIII gave us the leap year – but his legacy goes ...

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   Mar 5, 2024 · Introduced in 46 BC, the Julian calendar fell short of the solar year – the time it takes Earth to orbit the Sun – by about 12 minutes each year. To correct this, Gregory convened a commission of experts who fine-tuned the leap-year system, giving us the one we have today. But the Gregorian calendar isn’t the only legacy Pope Gregory left.

6. www.britannica.com › topic › Gregorian-calendarGregorian calendar | Definition & Facts | Britannica

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   5 days ago · Accessed 26 October 2024. Gregorian calendar, solar dating system now in general use. It was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar. The Gregorian calendar differs from the Julian only in that no century year is a leap year unless it is exactly divisible by 400 (e.g., 2000).

   • Author: The Editors of Encyclopaedia Britannica

   • The Gregorian calendar is a solar dating system used by most of the world. It is named for Pope Gregory XIII, who issued the papal bull Inter gravi...
   • Although the Julian calendar was the dominant European dating system for more than 1,600 years, its solar year measurements (365.25 days versus the...
   • The Gregorian calendar was adopted by much of Catholic Europe in 1582, as directed by Pope Gregory XIII in the papal bull Inter gravissimas, which...

7. en.wikipedia.org › wiki › Gregorian_calendarGregorian calendar - Wikipedia

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   Gregorian calendar. The Gregorian calendar is the calendar used in most parts of the world. [1][a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years ...

8. People also ask

   Why did Pope Gregory XIII change the Julian calendar?

   • This change, instigated by Pope Gregory XIII in 1582, was aimed at correcting the inaccuracies of the Julian calendar, established by Julius Caesar in 46 BCE, which had drifted significantly over the centuries. The Julian calendar introduced a leap year system to approximate the solar year’s length, with a year lasting 365.25 days.

   The Switch to the Gregorian Calendar and How Ten Days Vanished

   worldhistoryedu.com/the-switch-to-the-gregorian-calendar-and-how-ten-days-vanished/

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   Why did Pope Gregory XIII reform the calendar?

   • On this day, February 29, conversations the world over may conjure the name of Pope Gregory XIII – widely known for his reform of the calendar that bears his name. The need for calendar reform was driven by the inaccuracy of the Julian calendar.

   Pope Gregory XIII gave us the leap year - The Conversation

   theconversation.com/pope-gregory-xiii-gave-us-the-leap-year-but-his-legacy-goes-much-further-223093

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   Does the Gregorian calendar have a leap year?

   • The Julian calendar had a leap year every four years, without exception. The Gregorian calendar adds a leap year every four years but omits it in years divisible by 100, unless they are also divisible by 400. This adjustment more accurately aligns the calendar with the solar year. Why was the Gregorian calendar adopted?

   The Switch to the Gregorian Calendar and How Ten Days Vanished

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   Did Pope Gregory leave a Gregorian calendar?

   • To correct this, Gregory convened a commission of experts who fine-tuned the leap-year system, giving us the one we have today. But the Gregorian calendar isn’t the only legacy Pope Gregory left. His papacy encompassed a broad spectrum of achievements that have left a lasting mark on the world.

   Pope Gregory XIII gave us the leap year - The Conversation

   theconversation.com/pope-gregory-xiii-gave-us-the-leap-year-but-his-legacy-goes-much-further-223093

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   When did the Gregorian calendar change?

   • The Protestant regions of Germany and the Netherlands switched in the 17th century. Great Britain and the territories of the British Empire followed suit in 1752, spreading the Gregorian calendar around the globe. In 1582 Pope Gregory XIII introduced a more accurate calendar. But switching over wasn’t easy.

   Ten Days That Vanished: The Switch to the Gregorian Calendar

   www.britannica.com/story/ten-days-that-vanished-the-switch-to-the-gregorian-calendar

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   Is the Gregorian calendar better than the Julian calendar?

   • While the Gregorian calendar significantly improved the accuracy of the calendar year compared to the Julian calendar, it is not perfect. The solar year is slightly less than 365.25 days, and even the Gregorian correction does not perfectly match this.

   The Switch to the Gregorian Calendar and How Ten Days Vanished

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9. worldhistoryedu.com › the-switch-to-the-gregorianThe Switch to the Gregorian Calendar and How Ten Days Vanished

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   Mar 12, 2024 · This shift required that September 2, 1752, be followed by September 14, 1752, resulting in widespread confusion and, according to some accounts, protests. The adoption of the Gregorian calendar outside Europe occurred over an even longer period, influenced by colonization, trade, and the spread of European power.