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October 21st in Astronomy and Space Science
Invention1923The Deutsches Museum in Munich opens the world's first planetarium.
Death1967Danish chemist and astronomer Ejnar Hertzsprung dies. He is most well known for the Hertzsprung-Russell diagram that relates the spectral color of a star to its intrinsic brightness and is important in understanding a star's classification and evolution. Hertzsprung and American astronomer Henry Norris Russell independently derived the color-luminosity relation. Hertzsprung also calibrated the cepheid period-luminosity relationship first discovered by Henrietta Leavitt and used it to determine the distance to the Small Magellanic Cloud.
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