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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 ...
A map of Europe as it appeared in 1815 after the Congress of Vienna. This article gives a detailed listing of all the countries, including puppet states, that have existed in Europe since the Congress of Vienna in 1815 to the present day. Each country has information separated into columns: name of the distinct country, its lifespan, the ...
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 ...
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.
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.
Cambodia – Kingdom of Cambodia Cayor – Kingdom of Cayor → Central America. United Provinces of Central America (from July 1, 1823 to 1824); Federal Republic of Central America (from 1824)
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 ...
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. —