The temperature on June 15, 1953 was between 11.7 °C and 18.9 °C and averaged 15.0 °C. There was 1.6 mm of rain during 1.1 hours. There was 4.6 hours of sunshine (28%). The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 31 » A North Sea flood causes over 1,800 deaths in the Netherlands and over 300 in the United Kingdom.
May 18 » Jackie Cochran becomes the first woman to break the sound barrier.
July 17 » The largest number of United States midshipman casualties in a single event results from an aircraft crash in Florida, killing 44.
September 21 » Lieutenant No Kum-sok, a North Korean pilot, defects to South Korea with his jet fighter.
October 29 » BCPA Flight 304 DC-6 crashes near San Francisco.
November 23 » Pilot Felix Moncla and Lieutenant Robert Wilson disappear while in pursuit of a mysterious craft over Lake Superior.
Day of death May 12, 1975
The temperature on May 12, 1975 was between 3.2 °C and 14.1 °C and averaged 9.5 °C. There was -0.1 mm of rain. There was 9.8 hours of sunshine (63%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
February 4 » Haicheng earthquake (magnitude 7.3 on the Richter scale) occurs in Haicheng, Liaoning, China.
February 9 » The Soyuz 17 Soviet spacecraft returns to Earth.
April 3 » Bobby Fischer refuses to play in a chess match against Anatoly Karpov, giving Karpov the title of World Champion by default.
June 5 » The Suez Canal opens for the first time since the Six-Day War.
July 15 » Space Race: Apollo–Soyuz Test Project features the dual launch of an Apollo spacecraft and a Soyuz spacecraft on the first joint Soviet-United States human-crewed flight. It was both the last launch of an Apollo spacecraft, and the Saturn family of rockets.
September 29 » WGPR becomes the first black-owned-and-operated television station in the US.
When copying data from this family tree, please include a reference to the origin: Guido Davus , "Jannis family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-jannis/I4232.php : accessed March 10, 2026), "Clement Mertens (1953-1975)".
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