The temperature on May 21, 1752 was about 12.0 °C. There was 2 mm of rainWind direction mainly northeast. Weather type: regen omtrent helder. Source: KNMI
February 29 » King Alaungpaya founds Konbaung Dynasty, the last dynasty of Burmese monarchy.
April 20 » Start of Konbaung–Hanthawaddy War, a new phase in the Burmese Civil War (1740–57).
June 15 » Benjamin Franklin proves that lightning is electricity (traditional date, the exact date is unknown).
September 2 » Great Britain, along with its overseas possessions, adopts the Gregorian calendar.
September 14 » The British Empire adopts the Gregorian calendar, skipping eleven days (the previous day was September 2).
Day of marriage April 20, 1781
The temperature on April 20, 1781 was about 14.0 °C. There was 4 mm of rainWind direction mainly south-southwest. Weather type: regen geheel betrokken. Source: KNMI
January 5 » American Revolutionary War: Richmond, Virginia, is burned by British naval forces led by Benedict Arnold.
March 13 » William Herschel discovers Uranus.
June 3 » Jack Jouett begins his midnight ride to warn Thomas Jefferson and the Virginia legislature of an impending raid by Banastre Tarleton.
September 4 » Los Angeles is founded as El Pueblo de Nuestra Señora La Reina de los Ángeles (The Village of Our Lady, the Queen of the Angels) by 44 Spanish settlers.
September 6 » The Battle of Groton Heights takes place, resulting in a British victory.
November 29 » The crew of the British slave ship Zong murders 133 Africans by dumping them into the sea to claim insurance.
When copying data from this family tree, please include a reference to the origin: Leen Schaap, "Database Schaap", database, Genealogy Online (https://www.genealogieonline.nl/database-schaap/I9899.php : accessed February 9, 2026), "Jan Adriaansz de Boer (1752-????)".
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