1690 (MDCXC) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1690th year of the Common Era (CE) and Anno Domini (AD) designations, the 690th year of the 2nd millennium, the 90th year of the 17th century, and the 1st year of the 1690s decade. As of the start of 1690, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

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