Template:Selected anniversaries/April 21: Difference between revisions

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|| *** DONE: Pics ***
|| *** DONE: Pics ***
||900: The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines). Pic.


||1506: The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics. Pic.
||1506: The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics. Pic.
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||1792: Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered. Pic.
||1792: Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered. Pic.


||1792: John Michell dies ... natural philosopher and clergyman who provided pioneering insights in a wide range of scientific fields, including astronomy, geology, optics, and gravitation. Considered "one of the greatest unsung scientists of all time", he was the first person known to propose the existence of black holes in publication, the first to suggest that earthquakes travel in waves, the first to explain how to manufacture artificial magnets, and the first to apply statistics to the study of the cosmos, recognizing that double stars were a product of mutual gravitation. He also invented an apparatus to measure the mass of the Earth. Pic: https://www.ecured.cu/John_Michell
||1793: John Michell dies ... natural philosopher and clergyman who provided pioneering insights in a wide range of scientific fields, including astronomy, geology, optics, and gravitation. Considered "one of the greatest unsung scientists of all time", he was the first person known to propose the existence of black holes in publication, the first to suggest that earthquakes travel in waves, the first to explain how to manufacture artificial magnets, and the first to apply statistics to the study of the cosmos, recognizing that double stars were a product of mutual gravitation. He also invented an apparatus to measure the mass of the Earth. Pic: https://www.ecured.cu/John_Michell
 
||1793: John Michell dies ... geologist and astronomer. Pic search.


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.

Revision as of 08:20, 20 April 2020

  • 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.

  • 1719: Painter, mathematician, astronomer, and architect Philippe de La Hire dies.

    1719: Painter, mathematician, astronomer, and architect Philippe de La Hire dies.

  • 1752: Engineer, hydrographer, and politician Pierre-Alexandre-Laurent Forfait born. He will design and oversee the building of ships, making structural improvements and developing techniques to improve the disposition of cargo in ships' holds.

    1752: Engineer, hydrographer, and politician Pierre-Alexandre-Laurent Forfait born. He will design and oversee the building of ships, making structural improvements and developing techniques to improve the disposition of cargo in ships' holds.

  • 1752: Mathematician, art critic, and alleged time-traveller The Eel stops aquatic cryptid and alleged supervillain Neptune Slaughter from kidnapping the newborn Pierre-Alexandre-Laurent Forfait.

    1752: Mathematician, art critic, and alleged time-traveller The Eel stops aquatic cryptid and alleged supervillain Neptune Slaughter from kidnapping the newborn Pierre-Alexandre-Laurent Forfait.

  • 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.

  • 1825: Mathematician Johann Friedrich Pfaff dies. He worked on partial differential equations of the first order Pfaffian systems, as they are now called, which became part of the theory of differential forms.

    1825: Mathematician Johann Friedrich Pfaff dies. He worked on partial differential equations of the first order Pfaffian systems, as they are now called, which became part of the theory of differential forms.

  • 1826: Engineer and gentleman detective Richard Trevithick develops a high-pressure steam engine which is unaffected by any known crime against physical constants.

    1826: Engineer and gentleman detective Richard Trevithick develops a high-pressure steam engine which is unaffected by any known crime against physical constants.

  • 1881: 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 memory."

    1881: 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 memory."

  • 1882: Physicist and academic Percy Williams Bridgman born. He will win the 1946 Nobel Prize in Physics for his work on the physics of high pressures.

    1882: Physicist and academic Percy Williams Bridgman born. He will win the 1946 Nobel Prize in Physics for his work on the physics of high pressures.

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

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

  • 1910: Writer, entrepreneur, publisher and lecturer Mark Twain dies.

    1910: Writer, entrepreneur, publisher and lecturer Mark Twain dies.

  • 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.)

  • 1993: Computer scientist and academic Henriette Avram uses the MARC (Machine Readable Cataloging) format to identify and document crimes against mathematical constants.

    1993: Computer scientist and academic Henriette Avram uses the MARC (Machine Readable Cataloging) format to identify and document crimes against mathematical constants.

  • 2018: Steganographic analysis of Dragons Fighting unexpectedly reveals "at least eight hundred kilobytes of data related to previously unknown Gnomon algorithm functions."

    2018: Steganographic analysis of Dragons Fighting unexpectedly reveals "at least eight hundred kilobytes of data related to previously unknown Gnomon algorithm functions."

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