Day in Engineering History Archive - June 22

June 22

1633: Galileo Galilei was forced by the Inquisition to "abjure, curse, and detest" his Copernican heliocentric views. 1675: The Royal Greenwich Observatory in England was created via Royal Warrant by Charles II. 1925: Felix Klein, mathematician and creator of the single-surfaced Klein bottle, died. 1941: Germany invaded Stalin's Soviet Union during World War II. 1946: Jet airplanes were used to transport mail for the first time. 1954: Karl Compton, who directed the development of radar during WWII, died. 1973: The first manned Skylab (Skylab 2) crew of astronauts splashed down safely after a then record 28 days in space. 1978: James Christy and Robert Harrington discovered Charon, the only known moon of Pluto. 1983: For the first time a satellite was retrieved from orbit by the Space Shuttle. 1993: Intel introduced the 80586, 64-bit, 60 MHz Pentium processor.

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Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in this article, there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative sources. On RF Cafe, events with hyperlinks have been verified. Many years ago, I began commemorating the birthdays of notable people and events with special RF Cafe logos. Where available, I like to use images from postage stamps from the country where the person or event occurred. Images used in the logos are often from open source websites like Wikipedia, and are specifically credited with a hyperlink back to the source where possible. Fair Use laws permit small samples of copyrighted content.