Template:Selected anniversaries/October 21: Difference between revisions
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||1967 – The Soviet space probe Venera 4 became the first spacecraft to perform direct in situ analysis of the environment of another planet (Venus). | ||1967 – The Soviet space probe Venera 4 became the first spacecraft to perform direct in situ analysis of the environment of another planet (Venus). | ||
||Ejnar Hertzsprung (d. 1967) was a Danish chemist and astronomer, born in Copenhagen, Denmark. In the period 1911–1913, together with Henry Norris Russell, he developed the Hertzsprung–Russell diagram. | |||
File:Wacław Sierpiński.jpg|link=Wacław Sierpiński (nonfiction)|1969: Mathematician and academic [[Wacław Sierpiński (nonfiction)|Wacław Sierpiński]] dies. He made important contributions to set theory (research on the axiom of choice and the continuum hypothesis), number theory, theory of functions, and topology. | File:Wacław Sierpiński.jpg|link=Wacław Sierpiński (nonfiction)|1969: Mathematician and academic [[Wacław Sierpiński (nonfiction)|Wacław Sierpiński]] dies. He made important contributions to set theory (research on the axiom of choice and the continuum hypothesis), number theory, theory of functions, and topology. | ||
Revision as of 11:52, 26 November 2017
1687: Mathematician and theorist Nicolaus I Bernoulli born. He will introduce a successful resolution to the St. Petersburg paradox.
1914: Mathematics and science writer Martin Gardner born. His interests will include stage magic, scientific skepticism, philosophy, religion, and literature.
1958: National Pareidolia Day declared in the United States.
1969: Mathematician and academic Wacław Sierpiński dies. He made important contributions to set theory (research on the axiom of choice and the continuum hypothesis), number theory, theory of functions, and topology.
2017: Green Spiral 9 feels more green than ever, according to new chromatographic analysis.