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1656: Mathematician and physicist Thomas Fincke dies. He introduced the modern names of the trigonometric functions tangent and secant.
1914: The Franck–Hertz experiment, a pillar of quantum mechanics, is presented to the German Physical Society.
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.

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	== Gnomon Chronicles: April 23 ==		== Gnomon Chronicles: April 24 ==

	{{Selected anniversaries/April 23}}		{{Selected anniversaries/April 24}}