The temperature on April 30, 1959 was between 8.6 °C and 12.0 °C and averaged 10.5 °C. There was 1.8 mm of rain during 4.9 hours. The almost completely overcast was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
April 9 » Project Mercury: NASA announces the selection of the United States' first seven astronauts, whom the news media quickly dub the "Mercury Seven".
June 30 » A United States Air Force F-100 Super Sabre from Kadena Air Base, Okinawa, crashes into a nearby elementary school, killing 11 students plus six residents from the local neighborhood.
July 1 » Specific values for the international yard, avoirdupois pound and derived units (e.g. inch, mile and ounce) are adopted after agreement between the US, the United Kingdom and other Commonwealth countries.
September 16 » The first successful photocopier, the Xerox 914, is introduced in a demonstration on live television from New York City.
September 18 » Vanguard 3 is launched into Earth orbit.
December 3 » The current flag of Singapore is adopted, six months after Singapore became self-governing within the British Empire.
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/I187449.php : accessed January 19, 2026), "Petronella Johanna Christianen (± 1873-1959)".
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