Ejnar Hertzsprung Biography
Ejnar Hertzsprung (Danish: [ɑjnɐ ˈhæɐ̯dsbʁɔŋ]; 8 October 1873 – 21 October 1967) was a Danish chemist and astronomer born in Copenhagen. In the period 1911–1913, together with Henry Norris Russell, he developed the Hertzsprung–Russell diagram.
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