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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…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 1820 | - Kali Yuga | 4920–4921 | 1.00 | infobox |
| 1820 | - Shaka Samvat | 1741–1742 | 1.00 | infobox |
| 1820 | - Vikram Samvat | 1876–1877 | 1.00 | infobox |
| 1820 | Ab urbe condita | 2573 | 1.00 | infobox |
| 1820 | Armenian calendar | 1269 ԹՎ ՌՄԿԹ | 1.00 | infobox |
| 1820 | Assyrian calendar | 6570 | 1.00 | infobox |
| 1820 | Balinese saka calendar | 1741–1742 | 1.00 | infobox |
| 1820 | Bengali calendar | 1226–1227 | 1.00 | infobox |
| 1820 | Berber calendar | 2770 | 1.00 | infobox |
| 1820 | British Regnal year | 60 Geo. 3 – 1 Geo. 4 | 1.00 | infobox |
| 1820 | Buddhist calendar | 2364 | 1.00 | infobox |
| 1820 | Burmese calendar | 1182 | 1.00 | infobox |
| 1820 | Byzantine calendar | 7328–7329 | 1.00 | infobox |
| 1820 | Chinese calendar | 己卯年 (Earth Rabbit) 4517 or 4310 — to — 庚辰年 (Metal Dragon) 4518 or 4311 | 1.00 | infobox |
| 1820 | Coptic calendar | 1536–1537 | 1.00 | infobox |
| 1820 | Discordian calendar | 2986 | 1.00 | infobox |
| 1820 | Ethiopian calendar | 1812–1813 | 1.00 | infobox |
| 1820 | Gregorian calendar | 1820 MDCCCXX | 1.00 | infobox |
| 1820 | Hebrew calendar | 5580–5581 | 1.00 | infobox |
| 1820 | Holocene calendar | 11820 | 1.00 | infobox |
| 1820 | Igbo calendar | 820–821 | 1.00 | infobox |
| 1820 | Iranian calendar | 1198–1199 | 1.00 | infobox |
| 1820 | Islamic calendar | 1235–1236 | 1.00 | infobox |
| 1820 | Japanese calendar | Bunsei 3 (文政3年) | 1.00 | infobox |
| 1820 | Javanese calendar | 1747–1748 | 1.00 | infobox |
| 1820 | Julian calendar | Gregorian minus 12 days | 1.00 | infobox |
| 1820 | Korean calendar | 4153 | 1.00 | infobox |
| 1820 | Minguo calendar | 92 before ROC 民前92年 | 1.00 | infobox |
| 1820 | Nanakshahi calendar | 352 | 1.00 | infobox |
| 1820 | Thai solar calendar | 2362–2363 | 1.00 | infobox |
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