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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 ...
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.
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. —
The rule is that if the year is divisible by 100 and not divisible by 400, the leap year is skipped. The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not. The ...
The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. The O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different.
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.
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 ...
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 ...