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, 1779
The temperature on April 20, 1779 was about 12.0 °C. Wind direction mainly west-southwest. Weather type: omtrent helder. Special wheather fenomena: noorderlicht. Source: KNMI
February 14 » American Revolutionary War: The Battle of Kettle Creek is fought in Georgia.
February 14 » James Cook is killed by Native Hawaiians near Kealakekua on the Island of Hawaii.
June 24 » American Revolutionary War: The Great Siege of Gibraltar begins.
September 23 » American Revolution: John Paul Jones, naval commander of the United States, on board the USSBonhomme Richard, wins the Battle of Flamborough Head.
September 28 » American Revolution: Samuel Huntington is elected President of the Continental Congress, succeeding John Jay.
October 18 » American Revolutionary War: The Franco-American Siege of Savannah is lifted.
When copying data from this family tree, please include a reference to the origin: Johan Vanoplynes, "Family tree Vanoplynes", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-vanoplynes/I520177.php : accessed February 19, 2026), "Maria Agnes Bostyn (1752-????)".
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