Template:Selected anniversaries/April 6: Difference between revisions
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||1551: Joachim Vadian dies ... physician, scholar, humanist, and politician. Pic. | ||1551: Joachim Vadian dies ... physician, scholar, humanist, and politician. Pic. | ||
||1749: Samuel Vince born ... clergyman, mathematician and astronomer at the University of Cambridge. Pic. | ||1749: Samuel Vince born ... clergyman, mathematician and astronomer at the University of Cambridge. Pic. | ||
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||1886: Walter Dandy born ... physician and neurosurgeon. Pic. | ||1886: Walter Dandy born ... physician and neurosurgeon. Pic. | ||
||1890: André-Louis Danjon born ... astronomer who devised a now standard five-point scale for rating the darkness and colour of a total lunar eclipse, which is known as the Danjon Luminosity Scale. He studied Earth's rotation, and developed astronomical instruments, including a photometer to measure Earthshine - the brightness of a dark moon due to light reflected from Earth. It consisted of a telescope in which a prism split the Moon's image into two identical side-by-side images. By adjusting a diaphragm to dim one of the images until the sunlit portion had the same apparent brightness as the earthlit portion on the unadjusted image, he could quantify the diaphragm adjustment, and thus had a real measurement for the brightness of Earthshine.*TIS Pic search. | ||1890: André-Louis Danjon born ... astronomer who devised a now standard five-point scale for rating the darkness and colour of a total lunar eclipse, which is known as the Danjon Luminosity Scale. He studied Earth's rotation, and developed astronomical instruments, including a photometer to measure Earthshine - the brightness of a dark moon due to light reflected from Earth. It consisted of a telescope in which a prism split the Moon's image into two identical side-by-side images. By adjusting a diaphragm to dim one of the images until the sunlit portion had the same apparent brightness as the earthlit portion on the unadjusted image, he could quantify the diaphragm adjustment, and thus had a real measurement for the brightness of Earthshine.*TIS Pic search. | ||
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||2012: Fang Lizhi dies ... Chinese astrophysicist and activist whose liberal ideas inspired the pro-democracy student movement of 1986–87 and, finally, the Tiananmen Square protests of 1989. Pic. | ||2012: Fang Lizhi dies ... Chinese astrophysicist and activist whose liberal ideas inspired the pro-democracy student movement of 1986–87 and, finally, the Tiananmen Square protests of 1989. Pic. | ||
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Revision as of 20:58, 26 January 2022
1528: Painter, engraver, and mathematician Albrecht Dürer dies. Dürer is regarded as the greatest German Renaissance artist: his vast body of work will include altarpieces and religious works, numerous portraits and self-portraits, and copper engravings.
1793: During the French Revolution, the Committee of Public Safety becomes the executive organ of the republic.
1829: Mathematician and theorist Niels Henrik Abel dies. Abel made pioneering contributions in a variety of fields, including the discovery of Abelian functions, and the first complete proof demonstrating the impossibility of solving the general quintic equation in radicals.
1926: American comic book artist Gil Kane born. Kane will pioneer graphic novels with his books His Name is...Savage (1968) and Blackmark (1971).
1992: Writer Isaac Asimov dies. Asimov is one of the "Big Three" science fiction writers of his generation.
2003: Computer scientist Anita Borg dies. Borg founded the Anita Borg Institute for Women and Technology.