Template:Selected anniversaries/September 25

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

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  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.

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

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  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."

• In the late 1920s, Cramér became interested in the field of probability, which at the time was not an accepted branch of mathematics. Cramér knew that a radical change was needed in this field, and
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  2003: Journalist, writer, literary editor, and actor George Plimpton dies.