March 22 » Before the Société pour L'Encouragement à l'Industrie, brothers Auguste and Louis Lumière demonstrate movie film technology publicly for the first time.
May 7 » In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
June 28 » The United States Court of Private Land Claims rules James Reavis’s claim to Barony of Arizona is "wholly fictitious and fraudulent."
September 18 » The Atlanta Exposition Speech on race relations is delivered by Booker T. Washington.
October 21 » The Republic of Formosa collapses as Japanese forces invade.
December 28 » The Lumière brothers perform for their first paying audience at the Grand Cafe in Boulevard des Capucines.
Day of death September 15, 1973
The temperature on September 15, 1973 was between 8.2 °C and 25.0 °C and averaged 16.7 °C. There was 10.7 hours of sunshine (84%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
In The Netherlands , there was from Thursday, July 20, 1972 to Friday, May 11, 1973 the cabinet Biesheuvel II, with Mr. B.W. Biesheuvel (ARP) as prime minister.
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.
January 14 » Elvis Presley's concert Aloha from Hawaii is broadcast live via satellite, and sets the record as the most watched broadcast by an individual entertainer in television history.
January 15 » Vietnam War: Citing progress in peace negotiations, President Richard Nixon announces the suspension of offensive action in North Vietnam.
February 22 » Cold War: Following President Richard Nixon's visit to the People's Republic of China, the two countries agree to establish liaison offices.
October 25 » Egypt and Israel accept United Nations Security Council Resolution 339.
November 3 » Mariner program: NASA launches the Mariner 10 toward Mercury. On March 29, 1974, it becomes the first space probe to reach that planet.
November 25 » Georgios Papadopoulos, head of the military Regime of the Colonels in Greece, is ousted in a hardliners' coup led by Brigadier General Dimitrios Ioannidis.
When copying data from this family tree, please include a reference to the origin: Ellen Stempher-Hellwig, "Family tree Hellwig", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-hellwig/R144.php : accessed March 3, 2026), "Mai - Maria Barbara /Helwig (Mai - Maria Barbara) Hellewig (1895-1973)".
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