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Millennium: 2nd millennium
1820 in various calendars
Gregorian calendar 1820
Ab urbe condita 2573
Armenian calendar 1269
Assyrian calendar 6570
Balinese saka calendar 1741–1742
Bengali calendar 1227
Berber calendar 2770
British Regnal year 60 Geo. 3 – 1 Geo. 4
Buddhist calendar 2364
Burmese calendar 1182
Byzantine calendar 7328–7329
Chinese calendar 己卯(Earth Rabbit)
4516 or 4456
    — to —
庚辰年 (Metal Dragon)
4517 or 4457
Coptic calendar 1536–1537
Discordian calendar 2986
Ethiopian calendar 1812–1813
Hebrew calendar 5580–5581
Hindu calendars
 - Vikram Samvat 1876–1877
 - Shaka Samvat 1741–1742
 - Kali Yuga 4920–4921
Holocene calendar 11820
Igbo calendar 820–821
Iranian calendar 1198–1199
Islamic calendar 1235–1236
Japanese calendar Bunsei 3
Javanese calendar 1747–1748
Julian calendar Gregorian minus 12 days
Korean calendar 4153
Minguo calendar 92 before ROC
Nanakshahi calendar 352
Thai solar calendar 2362–2363
Tibetan calendar 阴土兔年
(female Earth-Rabbit)
1946 or 1565 or 793
    — to —
(male Iron-Dragon)
1947 or 1566 or 794

1820 (MDCCCXX) 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 Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.






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King George III



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