20 дек 1690 г. - Tsar Peter the Great decrees that the Russian calendar will move New Year's Day to January 1 rather than September 1, effective January 1, 1692. On the Russian calendar (which still uses the Julian system at this time, 10 days behind the Gregorian calendar which will be adopted in Russia more than 200 years later), 1691 has begun on what would otherwise be considered September 11, 1690
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