The temperature on August 5, 1887 was about 22.7 °C. The air pressure was 8 kgf/m2 and came mainly from the east-southeast. The airpressure was 77 cm mercury. The atmospheric humidity was 42%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
January 20 » The United States Senate allows the Navy to lease Pearl Harbor as a naval base.
February 2 » In Punxsutawney, Pennsylvania the first Groundhog Day is observed.
April 10 » On Easter Sunday, Pope Leo XIII authorizes the establishment of the Catholic University of America.
June 23 » The Rocky Mountains Park Act becomes law in Canada creating the nation's first national park, Banff National Park.
October 1 » Balochistan is conquered by the British Empire.
November 11 » August Spies, Albert Parsons, Adolph Fischer and George Engel are executed as a result of the Haymarket affair.
Day of marriage January 18, 1917
The temperature on January 18, 1917 was between -0.4 °C and 1.0 °C and averaged 0.6 °C. There was 1.9 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 17 » The United States pays Denmark $25 million for the Virgin Islands.
February 3 » First World War: The American entry into World War I begins when diplomatic relations with Germany are severed due to its unrestricted submarine warfare.
May 13 » Three children report the first apparition of Our Lady of Fátima in Fátima, Portugal.
June 4 » The first Pulitzer Prizes are awarded: Laura E. Richards, Maude H. Elliott, and Florence Hall receive the first Pulitzer for biography (for Julia Ward Howe). Jean Jules Jusserand receives the first Pulitzer for history for his work With Americans of Past and Present Days. Herbert B. Swope receives the first Pulitzer for journalism for his work for the New York World.
July 31 » World War I: The Battle of Passchendaele begins near Ypres in West Flanders, Belgium.
October 24 » First World War: Italy suffers a disastrous defeat on the Austro-Italian front.
Day of death May 18, 1953
The temperature on May 18, 1953 was between 7.6 °C and 19.9 °C and averaged 15.4 °C. There was 0.1 mm of rain during 1.0 hours. There was 1.9 hours of sunshine (12%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
February 11 » The Soviet Union breaks off diplomatic relations with Israel.
April 25 » Francis Crick and James Watson publish "Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid" describing the double helix structure of DNA.
May 25 » Nuclear weapons testing: At the Nevada Test Site, the United States conducts its first and only nuclear artillery test.
October 1 » Andhra State is formed, consisting of a Telugu-speaking area carved out of India's Madras State.
October 29 » BCPA Flight 304 DC-6 crashes near San Francisco.
December 9 » Red Scare: General Electric announces that all communist employees will be discharged from the company.
When copying data from this family tree, please include a reference to the origin: Gert Jonker, "Family tree Jonker", database, Genealogy Online (https://www.genealogieonline.nl/jonker_stamboom/I25691.php : accessed March 1, 2026), "Gerrit Valkeman (1887-1953)".
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