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Danish chemist and astronomer (1873–1967)

Ejnar Hertzsprung (Danish:[ˈɑjnɐˈhɛɐ̯tsˌpʁɔŋ]; 8 October 1873 – 21 October 1967) was a Danish chemist and astronomer.

Career

Hertzsprung was born in Frederiksberg, Denmark, the son of Severin and Henriette. He studied chemical engineering at Copenhagen Polytechnic Institute, graduating in 1898.

Ejnar hertzsprung

After spending two years working as a chemist in St. Petersburg, in 1901 he studied photochemistry at Leipzig University for a year.^[1] His father was an amateur astronomer, which led to Ejnar's interest in the subject.

He began making astronomical observations in Frederiksberg in 1902, and within a few years had noticed that stars with similar spectral type could have widely different absolute magnitudes. In 1909, he took a position at the Göttingen Observatory under director Karl Schwarzschild.^[2]

In 1911 Hertzsprung developed the Hertzsprung–Russell diagram, independently developed in 1913 b