The temperature on February 1, 1887 was about 3.7 °C. There was 1 mm of rain. The air pressure was 6 kgf/m2 and came mainly from the north-northwest. The airpressure was 76 cm mercury. The atmospheric humidity was 97%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
January 20 » The United States Senate allows the Navy to lease Pearl Harbor as a naval base.
February 2 » In Punxsutawney, Pennsylvania the first Groundhog Day is observed.
February 23 » The French Riviera is hit by a large earthquake, killing around 2,000.
May 9 » Buffalo Bill Cody's Wild West Show opens in London.
June 18 » The Reinsurance Treaty between Germany and Russia is signed.
July 26 » Publication of the Unua Libro, founding the Esperanto movement.
Day of death June 15, 1969
The temperature on June 15, 1969 was between 13.4 °C and 26.5 °C and averaged 19.7 °C. There was 10.5 hours of sunshine (63%). The partly clouded was. The average windspeed was 1 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
April 7 » The Internet's symbolic birth date: Publication of RFC 1.
July 20 » Apollo program: Apollo 11's crew successfully makes the first manned landing on the Moon in the Sea of Tranquility. Americans Neil Armstrong and Buzz Aldrin become the first humans to walk on the Moon six and a half hours later.
October 1 » Concorde breaks the sound barrier for the first time.
October 21 » The 1969 Somali coup d'état establishes a Marxist–Leninist administration.
October 29 » The first-ever computer-to-computer link is established on ARPANET, the precursor to the Internet.
November 21 » The first permanent ARPANET link is established between UCLA and SRI.
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/P19963.php : accessed January 3, 2026), "John Henry Tyler (1887-1969)".
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