The temperature on April 1, 1971 was between 3.4 °C and 8.5 °C and averaged 5.4 °C. The almost completely overcast was. The average windspeed was 1 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
January 21 » The current Emley Moor transmitting station, the tallest free-standing structure in the United Kingdom, begins transmitting UHF broadcasts.
February 8 » South Vietnamese ground troops launch an incursion into Laos to try to cut off the Ho Chi Minh trail and stop communist infiltration.
July 5 » The Twenty-sixth Amendment to the United States Constitution, lowering the voting age from 21 to 18 years, is formally certified by President Richard Nixon.
August 10 » The Society for American Baseball Research is founded in Cooperstown, New York.
August 15 » President Richard Nixon completes the break from the gold standard by ending convertibility of the United States dollar into gold by foreign investors.
October 27 » The Democratic Republic of the Congo is renamed Zaire.
When copying data from this family tree, please include a reference to the origin: Van Knippenberg, "Family tree Van Knippenberg", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-knippenberg/I6430.php : accessed January 31, 2026), "Sophia Inez Knippenberg (-1971)".
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