January 30 » The first Anglo-Japanese Alliance is signed in London.
April 2 » Dmitry Sipyagin, Minister of Interior of the Russian Empire, is assassinated in the Marie Palace, Saint Petersburg.
April 18 » The 7.5 Mw Guatemala earthquake shakes Guatemala with a maximum Mercalli intensity of VIII (Severe), killing between 800–2,000.
May 17 » Greek archaeologist Valerios Stais discovers the Antikythera mechanism, an ancient mechanical analog computer.
August 22 » Cadillac Motor Company is founded.
August 22 » Theodore Roosevelt becomes the first President of the United States to make a public appearance in an automobile.
Day of marriage February 20, 1930
The temperature on February 20, 1930 was between -3.1 °C and 7.9 °C and averaged 1.3 °C. There was 4.1 hours of sunshine (40%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-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.
January 30 » The Politburo of the Soviet Union orders the extermination of the Kulaks.
January 31 » 3M begins marketing Scotch Tape.
April 22 » The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
July 7 » Industrialist Henry J. Kaiser begins construction of Boulder Dam (now known as Hoover Dam).
August 29 » The last 36 remaining inhabitants of St Kilda are voluntarily evacuated to other parts of Scotland.
November 11 » Patent number US1781541 is awarded to Albert Einstein and Leó Szilárd for their invention, the Einstein refrigerator.
Day of death October 27, 1950
The temperature on October 27, 1950 was between -5.0 °C and 5.2 °C and averaged -0.4 °C. There was 6.2 hours of sunshine (62%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
January 17 » The Great Brink's Robbery: Eleven thieves steal more than $2 million from an armored car company's offices in Boston.
March 7 » Cold War: The Soviet Union issues a statement denying that Klaus Fuchs served as a Soviet spy.
May 29 » The St. Roch, the first ship to circumnavigate North America, arrives in Halifax, Nova Scotia, Canada.
June 24 » Apartheid: In South Africa, the Group Areas Act is passed, formally segregating races.
June 28 » Korean War: Suspected communist sympathizers (between 60,000 to 200,000) are executed in the Bodo League massacre.
July 20 » Cold War: In Philadelphia, Harry Gold pleads guilty to spying for the Soviet Union by passing secrets from atomic scientist Klaus Fuchs.
Day of burial October 30, 1950
The temperature on October 30, 1950 was between 1.8 °C and 8.0 °C and averaged 4.9 °C. There was 0.3 mm of rain during 0.3 hours. There was 1.0 hours of sunshine (10%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
When copying data from this family tree, please include a reference to the origin: Ruud Heemskerk, "Heemskerk door de eeuwen heen", database, Genealogy Online (https://www.genealogieonline.nl/heemskerk-door-de-eeuwen-heen/R525.php : accessed May 5, 2025), "Marius Theodorus Heemskerk (1902-1950)".
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