January 26 » The 8.7–9.2 Mw Cascadia earthquake takes place off the west coast of North America, as evidenced by Japanese records.
February 27 » The island of New Britain is discovered by Europeans.
February 28 » Today is followed by March 1 in Sweden, thus creating the Swedish calendar.
March 1 » Sweden introduces its own Swedish calendar, in an attempt to gradually merge into the Gregorian calendar, reverts to the Julian calendar on this date in 1712, and introduces the Gregorian calendar on this date in 1753.
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When copying data from this family tree, please include a reference to the origin: Hedwich de Vries, "Stamboom Wopke Kooistra en Hiske van Doezum", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-wierd-jans-kooistra/I396.php : accessed July 26, 2021), "Grietje Theunis Gaayckema".
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