Template:Selected anniversaries/April 24

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  1656: Mathematician and physicist Thomas Fincke dies. He introduced the modern names of the trigonometric functions tangent and secant.

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  1870: Mystic and faith healer Grigori Rasputin time travel device to commit crimes against mathematical constants.

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  1890: Time travel device develops self-awareness, visits John Ambrose Fleming.

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  1891: Miniaturized version of John Ambrose Fleming delivers lecture from within Fleming tube.

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  1967: Cosmonaut Vladimir Komarov dies in Soyuz 1 when its parachute fails to open. He is the first human to die during a space mission.

1899 – Oscar Zariski, Russian-American mathematician and academic (d. 1986)

1914 – The Franck–Hertz experiment, a pillar of quantum mechanics, is presented to the German Physical Society.

1919 – David Blackwell, American mathematician and academic (d. 2010)