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  2. 1820 - Wikipedia

    en.wikipedia.org/wiki/1820

    1820 was a leap year starting on Saturday of the Gregorian calendar and a leap year starting on Thursday of the Julian calendar, the 1820th year of the Common Era (CE) and Anno Domini (AD) designations, the 820th year of the 2nd millennium, the 20th year of the 19th century, and the 1st year of the 1820s decade. As of the start of 1820, the ...

  3. 1820s - Wikipedia

    en.wikipedia.org/wiki/1820s

    The 1820s was a decade of the Gregorian calendar that began on January 1, 1820, and ended on December 31, 1829.. It saw the rise of the First Industrial Revolution. Photography, rail transport, and the textile industry were among those that largely developed and grew prominent over the decade, as technology advanced significantly.

  4. Category:1820s in Europe - Wikipedia

    en.wikipedia.org/wiki/Category:1820s_in_Europe

    1820 in Europe (24 C, 9 P) 1821 in Europe (28 C, 10 P) ... Pages in category "1820s in Europe" This category contains only the following page.

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The rule for leap years is: Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the year 2000 is. —

  6. Category:1820 in Europe - Wikipedia

    en.wikipedia.org/wiki/Category:1820_in_Europe

    Pages in category "1820 in Europe" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. 0–9. 1820 in the United ...

  7. 2024 is a leap year, but why? Here’s the science behind the ...

    www.aol.com/news/2024-leap-why-science-behind...

    Years divisible by 100 (century years such as 1900 or 2000) cannot be leap years unless they are also divisible by 400. (For this reason, the years 1700, 1800, and 1900 were not leap years, but ...

  8. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    The year numbering followed the Rattanakosin Era until 1912, when it was replaced by the Buddhist era; see Thai solar calendar. Turkey: Ottoman Empire: 1917 15 Feb 1 Mar 13 The year numbering followed the Rumi calendar until 1 Jan 1926, when the Anno Domini era was adopted. Uganda: British Empire: 1893 31 Dec 13 Jan (1894) 12 Ukraine

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