jan 1, 1582 - Gregorian calender

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In Catholic countries in Europe the Gregorian calendar adds a refinement to the Julian calendar, amounting to a 0.002% correction in the length of the year. The change puts the date for the celebration of Easter to that agreed to at First Council of Nicaea in 325 CE. Protestant countries will begin to adopt the new calendar a century later, Orthodox Greeks in 1923.

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