1820
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1820 in topic: |
| Humanities |
| Archaeology – Architecture – Art – Literature – Music |
| By country |
| Australia – Brazil - Canada – Denmark - France – Germany – Mexico – Norway - Philippines - Portugal– Russia - South Africa – Spain - Sweden - United Kingdom – United States |
| Other topics |
| Rail Transport – Science – Sports |
| Lists of leaders |
| Sovereign states – State leaders – Territorial governors – Religious leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Works |
| Gregorian calendar | 1820 MDCCCXX |
| Ab urbe condita | 2573 |
| Armenian calendar | 1269 ԹՎ ՌՄԿԹ |
| Assyrian calendar | 6570 |
| 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 |
己卯年 (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 (文政３年) |
| Javanese calendar | 1747–1748 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4153 |
| Minguo calendar | 92 before ROC 民前92年 |
| Nanakshahi calendar | 352 |
| Thai solar calendar | 2362–2363 |
1820 (MDCCCXX) was a leap year starting on Saturday (dominical letter BA) of the Gregorian calendar and a leap year starting on Thursday (dominical letter DC) 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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