New Hampshire Astronomical SocietyOctober 8th in Astronomy and Space Science
 | 1873 | Danish chemist and astronomer Ejnar Hertzsprung born. 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 temperature 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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