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*'''Julian Calendar Discrepancy:''' Over time, the Julian calendar's slight inaccuracy, lacking leap years for years divisible by 100 but not 400, caused dates to drift from the actual seasons. This discrepancy led to a need for reform in the later centuries.<ref>"Gregorian Calendar." Encyclopædia Britannica, accessed December 14, 2023, https://www.britannica.com/science/Gregorian-calendar: https://www.britannica.com/science/Gregorian-calendar.</ref> | *'''Julian Calendar Discrepancy:''' Over time, the Julian calendar's slight inaccuracy, lacking leap years for years divisible by 100 but not 400, caused dates to drift from the actual seasons. This discrepancy led to a need for reform in the later centuries.<ref>"Gregorian Calendar." Encyclopædia Britannica, accessed December 14, 2023, https://www.britannica.com/science/Gregorian-calendar: https://www.britannica.com/science/Gregorian-calendar.</ref> | ||
=== | ===Adopting the Gregorian Calendar (18th Century)=== | ||
*'''1699:''' Sweden decides to adopt the Gregorian calendar in 1700, but instead of a one-time correction, they opt for a gradual 11-year adjustment, removing a day per year (except for 1701-10). This creates a unique "Old Style + 1 day" calendar, causing communication chaos with other countries. | *'''1699:''' Sweden decides to adopt the Gregorian calendar in 1700, but instead of a one-time correction, they opt for a gradual 11-year adjustment, removing a day per year (except for 1701-10). This creates a unique "Old Style + 1 day" calendar, causing communication chaos with other countries. | ||
*'''1711:''' King Karl XII abruptly switches back to the Julian calendar, ending the confusing interim period. | *'''1711:''' King Karl XII abruptly switches back to the Julian calendar, ending the confusing interim period. | ||
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