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Dual Dating of Using Calendars
- From 1582 until 1923, when the last European country adopted the Gregorian calendar, dual dating (sometimes with dual years) were seen.
- The dual years were because the Julian Calendar still had New Year's Day on March 25. For example, "10/21 February 1750/51" or 10 Feb 1750 (or O.S.)/Feb 21, 1751 Gregorian (or N.S.)
- For some countries that were to begin the Gregorian calendar later in the year, they rolled over the new year on January 1 but continued to use the Julian dates until they officially dropped some 10-13 days when moving to the new year.
- Example: January 1, 1751 (Juilan with New Year on March 25 in some countries), January 1, 1752 (Julian with the New Year on January 1 in Great Britian and its colonies since it was to begin the Gregorian year later that year), or January 12, 1752 (Gregorian date)
- ex: John Dee (1527-1608/9) was his year range using Julian - Julian/Gregorian years of birth and death.
- For dating between the Julian-1 and Julian-3-25- calendars, dual dating occurred on dates before March 25. Example: March 24 1609/10.
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