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  February 19
1473: Polish astronomer
Nicolaus
Copernicus, who published proof of a sun-centered solar system, was born. 1834:
Dutch ophthalmologist Herman Snellen, developer of the visual acuity
Snellen Chart
seen in all opticians' offices, was born. 1859:
Svante Arrhenius, whose famous
equation relating temperature change to chemical reactions and
is applied to semiconductor lifetime acceleration, was born. 1878: Thomas Edison
received a patent for his
phonograph. 1916:
Ernst Mach,
of speed of sound unit defining fame, died. 1945: During World War II, 30,000 U.S.
Marines landed on the island of
Iwo Jima,
where they encountered ferocious resistance from Japanese forces, and took control
of the strategically important island after a month-long battle. 1986: The
Soviet Union launched the Mir space station.
Note: These
historical tidbits (see daily
list) 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.
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