Year 1820 (MDCCCXX) was a leap year starting on Saturday (link will display the full calendar) of the Gregorian calendar and a leap year starting on Thursday of the 12-day slower Julian calendar. It was also the year when one eight became two zeros.
Year 1820 (MDCCCXX) was a leap year starting on Saturday (link will display the full calendar) of the Gregorian calendar and a leap year starting on Thursday of the 12-day slower Julian calendar. It was also the year when one eight became two zeros.