1582

1582 (MDLXXXII) was a common year starting on Monday of the Julian calendar, the 1582nd year of the Common Era (CE) and Anno Domini (AD) designations, the 582nd year of the 2nd millennium, the 82nd year of the 16th century, and the 3rd year of the 1580s decade. As of the start of 1582, the Gregorian calendar was 10 days ahead of the Julian calendar, which had previously been the universally accepted calendar in Christian nations. However, this year saw the beginning of the Gregorian Calendar switch, when the Papal bull known as Inter gravissimas introduced the Gregorian calendar, adopted by Spain, Portugal, the Polish–Lithuanian Commonwealth and most of present-day Italy from the start. In these countries, the year continued as normal until Thursday, October 4. However, the next day became Friday, October 15 (like a common year starting on Friday), in those countries (France followed two months later, letting Sunday, December 9 be followed by Monday, December 20). Other countries continued using the Julian calendar for decades or, in some cases, centuries.

Wikimedia Commons has media related to 1582.