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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 ...
Previously used the Korean calendar. In addition to the Gregorian calendar, the Juche calendar is in use. North Macedonia: Yugoslavia: 1919 14 Jan 28 Jan 13 [25] Norway: Denmark-Norway: 1700 18 Feb 1 Mar 11 Poland: Poland: 1582 4 Oct 15 Oct 10 Local resistance [21] Poland Duchy of Prussia: 1610 22 Aug 2 Sept 10 Southern Ducal Prussia is now ...
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
By the 20th century, the date on the Julian calendar was 13 days behind that on the Gregorian calendar. Romania adopted the Gregorian in 1919, with 31 March 1919 being followed by 14 April 1919. The last country of Eastern Orthodox Europe to adopt the Gregorian calendar for secular purposes was Greece, at the time under military administration ...
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.
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
Although the modern calendar has evolved, with adjustments made by the Gregorian calendar reform in 1582, the legacy of February's 28 days persists, maintaining a connection to ancient Roman ...
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.