What did ejnar hertzsprung discovery

Danish chemist and astronomer (–)

Ejnar Hertzsprung (Danish:[ˈɑjnɐˈhɛɐ̯tsˌpʁɔŋ]; 8 October – 21 October ) 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 After spending two years working as a chemist in St. Petersburg, in 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 , and within a few years had noticed that stars with similar spectral type could have widely different absolute magnitudes.

In , he took a position at the Göttingen Observatory under director Karl Schwarzschild.^[2]

In Hertzsprung developed the Hertzsprung–Russell diagram, independently developed in by Henry Norris Russell.

In Hertzsprung deter