what year is mdcccxx
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 ...