Ejnar Hertzsprung (1873–1967)
Born 1873 CE, died 1967 CE.
Ejnar Hertzsprung (Danish: [ˈɑjnɐ ˈhɛɐ̯tsˌpʁɔŋ]; 8 October 1873 – 21 October 1967) was a Danish chemist and astronomer. He is best remembered for his role in developing the Hertzsprung–Russell diagram of stars.
Text from the Wikipedia article Ejnar_Hertzsprung, licensed CC BY-SA 4.0.