Template:Selected anniversaries/September 25: Difference between revisions

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File:Mars Observer diagram.png|link=Mars Observer (nonfiction)|1992: NASA launches the [[Mars Observer (nonfiction)|Mars Observer]], a $511 million probe to [[Mars (nonfiction)|Mars]], in the first U.S. mission to the planet in 17 years. The probe will fail eleven months later.
File:Mars Observer diagram.png|link=Mars Observer (nonfiction)|1992: NASA launches the [[Mars Observer (nonfiction)|Mars Observer]], a $511 million probe to [[Mars (nonfiction)|Mars]], in the first U.S. mission to the planet in 17 years. The probe will fail eleven months later.


||2001: Robert W (Bob) Floyd dies ... computer scientist. His contributions include the design of the Floyd–Warshall algorithm (independently of Stephen Warshall), which efficiently finds all shortest paths in a graph, Floyd's cycle-finding algorithm for detecting cycles in a sequence, and his work on parsing. In one isolated paper he introduced the important concept of error diffusion for rendering images, also called Floyd–Steinberg dithering (though he distinguished dithering from diffusion). A significant achievement was pioneering the field of program verification using logical assertions with the 1967 paper Assigning Meanings to Programs. This was an important contribution to what later became Hoare logic.
||2001: Robert W (Bob) Floyd dies ... computer scientist. His contributions include the design of the Floyd–Warshall algorithm (independently of Stephen Warshall), which efficiently finds all shortest paths in a graph, Floyd's cycle-finding algorithm for detecting cycles in a sequence, and his work on parsing. In one isolated paper he introduced the important concept of error diffusion for rendering images, also called Floyd–Steinberg dithering (though he distinguished dithering from diffusion). A significant achievement was pioneering the field of program verification using logical assertions with the 1967 paper Assigning Meanings to Programs. This was an important contribution to what later became Hoare logic. Pic: https://cs.stanford.edu/memoriam/professor-robert-w-floyd


||2002: Arnold Ephraim Ross dies ... a mathematician and educator who founded the Ross Mathematics Program, a number theory summer program for gifted high school students. Pic.
||2002: Arnold Ephraim Ross dies ... a mathematician and educator who founded the Ross Mathematics Program, a number theory summer program for gifted high school students. Pic.

Revision as of 12:48, 3 September 2018

  • 1644: Astronomer and instrument maker Ole Rømer born. He will make the first quantitative measurements of the speed of light.

    1644: Astronomer and instrument maker Ole Rømer born. He will make the first quantitative measurements of the speed of light.

  • 1789: The United States Congress passes twelve amendments to the United States Constitution: The Congressional Apportionment Amendment (which was never ratified), the Congressional Compensation Amendment, and the ten that are known as the Bill of Rights.

    1789: The United States Congress passes twelve amendments to the United States Constitution: The Congressional Apportionment Amendment (which was never ratified), the Congressional Compensation Amendment, and the ten that are known as the Bill of Rights.

  • 1819: Mathematician and Anglican theologian George Salmon born. He will work in algebraic geometry for two decades, then devote the last forty years of his life to theology.

    1819: Mathematician and Anglican theologian George Salmon born. He will work in algebraic geometry for two decades, then devote the last forty years of his life to theology.

  • 1845: Judge Havelock With Glass is "a reasonably accurate depiction of events as I experienced them," according to the Judge.

    1845: Judge Havelock With Glass is "a reasonably accurate depiction of events as I experienced them," according to the Judge.

  • 1893: Mathematician and statistician Harald Cramér born. He will help found probability theory as a branch of mathematics, writing in 1926: "The probability concept should be introduced by a purely mathematical definition, from which its fundamental properties and the classical theorems are deduced by purely mathematical operations."

    1893: Mathematician and statistician Harald Cramér born. He will help found probability theory as a branch of mathematics, writing in 1926: "The probability concept should be introduced by a purely mathematical definition, from which its fundamental properties and the classical theorems are deduced by purely mathematical operations."

  • 1992: NASA launches the Mars Observer, a $511 million probe to Mars, in the first U.S. mission to the planet in 17 years. The probe will fail eleven months later.

    1992: NASA launches the Mars Observer, a $511 million probe to Mars, in the first U.S. mission to the planet in 17 years. The probe will fail eleven months later.

  • 2002: Steganographic analysis of Humpty Dumpty At Bat reveals previously unknown biography of Babe Ruth by Lewis Carroll.

    2002: Steganographic analysis of Humpty Dumpty At Bat reveals previously unknown biography of Babe Ruth by Lewis Carroll.

  • 2003: Journalist, writer, literary editor, and actor George Plimpton dies.

    2003: Journalist, writer, literary editor, and actor George Plimpton dies.

  • 2017: Dennis Paulson of Mars says that the twenty-fifth anniversary of the launch of the Mars Observer is a bittersweet event, because the spacecraft will be lost eleven months later.

    2017: Dennis Paulson of Mars says that the twenty-fifth anniversary of the launch of the Mars Observer is a bittersweet event, because the spacecraft will be lost eleven months later.

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