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 October 30, 1779
The temperature on October 30, 1779 was about 13.0 °C. There was 48 mm of rainWind direction mainly west-northwest. Weather type: regen geheel betrokken. 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 16 » Spain declares war on the Kingdom of Great Britain, and the Great Siege of Gibraltar begins.
July 6 » Battle of Grenada: The French defeat British naval forces during the American Revolutionary War.
August 13 » American Revolutionary War: The Royal Navy defeats the Penobscot Expedition with the most significant loss of United States naval forces prior to the attack on Pearl Harbor.
September 16 » American Revolutionary War: The Franco-American Siege of Savannah begins.
Day of death April 21, 1790
The temperature on April 21, 1790 was about 8.0 °C. Wind direction mainly east-northeast. Weather type: omtrent helder. Source: KNMI
March 4 » France is divided into 83 départements, cutting across the former provinces in an attempt to dislodge regional loyalties based on ownership of land by the nobility.
July 9 » The Swedish Navy captures one third of the Russian Baltic fleet.
July 12 » The Civil Constitution of the Clergy is passed in France by the National Constituent Assembly.
July 16 » The District of Columbia is established as the capital of the United States after signature of the Residence Act.
August 2 » The first United States Census is conducted.
December 17 » The Aztec calendar stone is discovered at El Zócalo, Mexico City.
When copying data from this family tree, please include a reference to the origin: Peter Deiman, "Family tree Deiman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-deiman/I312.php : accessed February 24, 2026), "Jan Jacobse van der Spek (1752-1790)".
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