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1820 (mdcccxx) wis a loup year starting oan seturday o' th' gregorian calendar 'n' a loup year starting oan thursday o' th' julian calendar, th' 1820th year o' th' common auld days (ce) 'n' anno domini (ad) designations, th' 820th year o' th' 2nd millennium, th' 20th year o' th' 19th hunner years, 'n' th' 1st year o' th' 1820s decade. As o' th' stairt o' 1820, th' gregorian calendar wis 12 days ahead o' th' julian calendar, whilk remained in localized uise 'til 1923.