1816 (MDCCCXVI) was a leap year starting on Monday (dominical letter GF) of the Gregorian calendar and a leap year starting on Saturday (dominical letter BA) of the Julian calendar, the 1816th year of the Common Era (CE) and Anno Domini (AD) designations, the 816th year of the 2nd millennium, the 16th year of the 19th century, and the 7th year of the 1810s decade. As of the start of 1816, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
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- date unknown
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This year was known as the 'Year Without a Summer' because of low temperatures in the Northern Hemisphere, the result of the Mount Tambora volcanic eruption in Indonesia in 1815. The sulfur from this eruption reflected the sun's rays and caused severe global cooling, catastrophic in some locations.