Template:Selected anniversaries/April 21: Difference between revisions

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||900 – The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines):
File:Petrus Apianus.jpg|link=Petrus Apianus (nonfiction)|1552: Mathematician and astronomer [[Petrus Apianus (nonfiction)|Petrus Apianus]] dies. His works on cosmography, ''Astronomicum Caesareum'' (1540) and ''Cosmographicus liber'' (1524), were extremely influential in his time.
 
||1506 – The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics.
 
||1557 – Petrus Apianus, German mathematician and astronomer (b. 1495)
 
||1642 – Simon de la Loubère, French mathematician, poet, and diplomat (d. 1729)
 
||1652 – Michel Rolle, French mathematician and academic (d. 1719)
 
File:Philippe de La Hire.jpg|link=Philippe de La Hire (nonfiction)|1719: Painter, mathematician, astronomer, and architect [[Philippe de La Hire (nonfiction)|Philippe de La Hire]] dies.  
 
||1752 – Pierre-Alexandre-Laurent Forfait, French engineer, hydrographer, and politician, French Minister of Marine and the Colonies (d. 1807)


File:Jean Baptiste Biot.jpg|link=Jean-Baptiste Biot (nonfiction)|1774: Physicist, astronomer, and mathematician [[Jean-Baptiste Biot (nonfiction)|Jean-Baptiste Biot]] born. He will establish the reality of meteorites, make an early balloon flight, and study the polarization of light.
File:Jean Baptiste Biot.jpg|link=Jean-Baptiste Biot (nonfiction)|1774: Physicist, astronomer, and mathematician [[Jean-Baptiste Biot (nonfiction)|Jean-Baptiste Biot]] born. He will establish the reality of meteorites, make an early balloon flight, and study the polarization of light.
||1792 – Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered.
File:Nathaniel Bowditch.jpg|link=Nathaniel Bowditch (nonfiction)|1793: American captain and mathematician [[Nathaniel Bowditch (nonfiction)|Nathaniel Bowditch]] publishes new class of [[Gnomon algorithm functions]] which improved maritime navigation techniques.


File:Hannibal Goodwin.jpg|link=Hannibal Goodwin (nonfiction)|1822: Priest and inventor [[Hannibal Goodwin (nonfiction)|Hannibal Goodwin]] born.  He will invent and patent rolled celluloid photographic film.
File:Hannibal Goodwin.jpg|link=Hannibal Goodwin (nonfiction)|1822: Priest and inventor [[Hannibal Goodwin (nonfiction)|Hannibal Goodwin]] born.  He will invent and patent rolled celluloid photographic film.


File:Francis Galton 1850s.jpg|link=Francis Galton (nonfiction)|1821: Polymath and crime-fighter [[Francis Galton (nonfiction)|Francis Galton]] publishes new class of [[Gnomon algorithm functions]] based on psychometrics which predict and prevent [[crimes against mathematical constants]].
File:Waking the Slate.jpg|link=The Waking of the Slate|1900: '''[[The Waking of the Slate]]''' ceremony is louder than ever.
 
||Johann Friedrich Pfaff (sometimes spelled Friederich; d. 21 April 1825) was a German mathematician.
 
File:Percy Williams Bridgman.jpg|link=Percy Williams Bridgman (nonfiction)|1882: Physicist and academic [[Percy Williams Bridgman (nonfiction)|Percy Williams Bridgman]] born. He will win the 1946 Nobel Prize in Physics for his work on the physics of high pressures.
 
File:Mark Twain Interviews Wallace War-Heels.jpg|link=Mark Twain Interviews Wallace War-Heels|1883: Twain reminisces about ''[[Mark Twain Interviews Wallace War-Heels]]'', calls it "the interview of a lifetime, and a singular bauble in the treasure-chest of my heart."
 
||1889 – Paul Karrer, Russian-Swiss chemist and academic, Nobel Prize laureate (d. 1971)
 
File:Mark Twain by Abdullah Frères, 1867.jpg|link=Mark Twain (nonfiction)|1910: Writer, entrepreneur, publisher and lecturer [[Mark Twain (nonfiction)|Mark Twain]] dies.
 
File:Richard Courant.jpg|link=Richard Courant (nonfiction)|1910: Mathematician [[Richard Courant (nonfiction)|Richard Courant]] demonostrates that the existence of a physical solution does not obviate proof of [[crimes against mathematical constants]].
 
||1914 – Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz.
 
||1918 – World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.
 
||1934 – The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1999, it is revealed to be a hoax).
 
||1954 – Emil Leon Post, Polish-American mathematician and logician (b. 1897)
 
||1960 – Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.
 
||Sir Frederick Handley Page, CBE, FRAeS (d. 21 April 1962) was an English industrialist who was a pioneer in the aircraft industry and became known as the father of the heavy bomber.
 
||1964 – A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.
 
||1965 – Edward Victor Appleton, English-Scottish physicist and academic, Nobel Prize laureate (b. 1892)
 
||1980 – Alexander Oparin, Russian biochemist and academic (b. 1894)
 
||1992 – The first discoveries of extrasolar planets are announced by astronomers Aleksander Wolszczan and Dale Frail. They discovered two planets orbiting the pulsar PSR 1257+12.


||2013 – Shakuntala Devi, Indian mathematician and astrologer (b. 1929)
File:Loch_Ness_Monster_Surgeon's_photograph.jpg|link=Loch Ness Monster (nonfiction)|1934: The "Surgeon's Photograph", the most famous photo allegedly showing the [[Loch Ness Monster (nonfiction)|Loch Ness Monster]], is published in the Daily Mail. (It will be revealed as a hoax in 1999.)


||2014 – The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and 15 deaths from Legionnaires disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.
File:Edward_Victor_Appleton_(1947).jpg|link=Edward Victor Appleton (nonfiction)|1965: Physicist and academic [[Edward Victor Appleton (nonfiction)|Edward Victor Appleton]] dies. Appleton made pioneering contributions to radiophysics, and was awarded the Nobel Prize in Physics in 1947 for his seminal work proving the existence of the ionosphere during experiments carried out in 1924.


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Latest revision as of 08:36, 11 November 2024

  • 1552: Mathematician and astronomer Petrus Apianus dies. His works on cosmography, Astronomicum Caesareum (1540) and Cosmographicus liber (1524), were extremely influential in his time.

    1552: Mathematician and astronomer Petrus Apianus dies. His works on cosmography, Astronomicum Caesareum (1540) and Cosmographicus liber (1524), were extremely influential in his time.

  • 1774: Physicist, astronomer, and mathematician Jean-Baptiste Biot born. He will establish the reality of meteorites, make an early balloon flight, and study the polarization of light.

    1774: Physicist, astronomer, and mathematician Jean-Baptiste Biot born. He will establish the reality of meteorites, make an early balloon flight, and study the polarization of light.

  • 1822: Priest and inventor Hannibal Goodwin born. He will invent and patent rolled celluloid photographic film.

    1822: Priest and inventor Hannibal Goodwin born. He will invent and patent rolled celluloid photographic film.

  • 1900: The Waking of the Slate ceremony is louder than ever.

    1900: The Waking of the Slate ceremony is louder than ever.

  • 1934: The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail. (It will be revealed as a hoax in 1999.)

    1934: The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail. (It will be revealed as a hoax in 1999.)

  • 1965: Physicist and academic Edward Victor Appleton dies. Appleton made pioneering contributions to radiophysics, and was awarded the Nobel Prize in Physics in 1947 for his seminal work proving the existence of the ionosphere during experiments carried out in 1924.

    1965: Physicist and academic Edward Victor Appleton dies. Appleton made pioneering contributions to radiophysics, and was awarded the Nobel Prize in Physics in 1947 for his seminal work proving the existence of the ionosphere during experiments carried out in 1924.

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