February 27 » The British Labour Party is founded.
May 18 » The United Kingdom proclaims a protectorate over Tonga.
June 25 » The Taoist monk Wang Yuanlu discovers the Dunhuang manuscripts, a cache of ancient texts that are of great historical and religious significance, in the Mogao Caves of Dunhuang, China.
October 19 » Max Planck discovers Planck's law of black-body radiation.
October 25 » The United Kingdom annexes the Transvaal.
November 7 » Second Boer War: Battle of Leliefontein, a battle during which the Royal Canadian Dragoons win three Victoria Crosses.
Day of marriage May 30, 1930
The temperature on May 30, 1930 was between 9.2 °C and 23.1 °C and averaged 16.2 °C. There was 12.5 hours of sunshine (77%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 18 » Elm Farm Ollie becomes the first cow to fly in a fixed-wing aircraft and also the first cow to be milked in an aircraft.
April 18 » The British Broadcasting Corporation announced that "there is no news" in their evening report.
June 16 » Sovnarkom establishes decree time in the USSR.
September 6 » Democratically elected Argentine president Hipólito Yrigoyen is deposed in a military coup.
September 27 » Bobby Jones wins the (pre-Masters) Grand Slam of golf.
December 29 » Sir Muhammad Iqbal's presidential address in Allahabad introduces the two-nation theory and outlines a vision for the creation of Pakistan.
When copying data from this family tree, please include a reference to the origin: Elly Gelderman, "Family tree Gelderman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-gelderman/I2589.php : accessed February 2, 2026), "Hendrika Johanna den Boesterd (1900-)".
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