The temperature on March 11, 1961 was between 5.9 °C and 10.9 °C and averaged 8.3 °C. The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
February 3 » The United States Air Forces begins Operation Looking Glass, and over the next 30 years, a "Doomsday Plane" is always in the air, with the capability of taking direct control of the United States' bombers and missiles in the event of the destruction of the SAC's command post.
February 12 » The Soviet Union launches Venera 1 towards Venus.
March 29 » The Twenty-third Amendment to the United States Constitution is ratified, allowing residents of Washington, D.C., to vote in presidential elections.
April 8 » A large explosion on board the MVDara in the Persian Gulf kills 238.
May 31 » In Moscow City Court, the Rokotov–Faibishenko show trial begins, despite the Khrushchev Thaw to reverse Stalinist elements in Soviet society.
November 21 » The "La Ronde" opens in Honolulu, first revolving restaurant in the United States.
When copying data from this family tree, please include a reference to the origin: Charles Olson, "Olson's Tree", database, Genealogy Online (https://www.genealogieonline.nl/olsons-tree/P25078.php : accessed February 18, 2026), "Katherine Beekman Hoppin (1874-1961)".
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