January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
February 14 » British forces begin the Battle of the Tugela Heights in an effort to lift the Siege of Ladysmith.
February 18 » Second Boer War: Imperial forces suffer their worst single-day loss of life on Bloody Sunday, the first day of the Battle of Paardeberg.
April 5 » Archaeologists in Knossos, Crete, discover a large cache of clay tablets with hieroglyphic writing in a script they call Linear B.
October 19 » Max Planck discovers Planck's law of black-body radiation.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death January 29, 1979
The temperature on January 29, 1979 was between -5.2 °C and 2.4 °C and averaged -0.2 °C. There was 2.5 mm of rain during 2.6 hours. The almost completely overcast was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
March 5 » Soviet probes Venera 11, Venera 12 and the German-American solar satellite Helios II all are hit by "off the scale" gamma rays leading to the discovery of soft gamma repeaters.
April 1 » Iran becomes an Islamic republic by a 99% vote, officially overthrowing the Shah.
May 25 » American Airlines Flight 191: A McDonnell Douglas DC-10 crashes during takeoff at O'Hare International Airport, Chicago, killing all 271 on board and two people on the ground.
July 16 » Iraqi President Ahmed Hassan al-Bakr resigns and is replaced by Saddam Hussein.
September 16 » The Sugarhill Gang were formed and rappers delight was released.
October 1 » Pope John Paul II begins his first pastoral visit to the United States.
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I495081.php : accessed January 24, 2026), "Gerrit Jan Koopman (1900-1979)".
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