Origins & Early Life

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

Pivotal Works & Achievements

After spending two years working as a chemist in St. Petersburg, in 1901 he studied photochemistry at Leipzig University for a year. 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.

Enduring Legacy & Impact

In 1911 Hertzsprung developed the Hertzsprung–Russell diagram, independently developed in 1913 by Henry Norris Russell. In 1913 Hertzsprung determined the distances to several Cepheid variable stars by parallax, and was thus able to calibrate the relationship, discovered by Henrietta Leavitt, between Cepheid...

Contemporary Figures & Related Historical Timelines

• Adolph Zukor — Contemporary (Born in 1873) (1873): Pioneering Hungarian-American film producer, co-founder of Paramount Pictures.
• Alessandro Manzoni — Contemporary (Died in 1873) (1873): Master poet and novelist whose work fueled the Italian Risorgimento and language unity.
• Alexander Bogdanov — Contemporary (Born in 1873) (1873): Polymath philosopher, pioneer of blood transfusion, and key Bolshevik revolutionary.
• Aleksandr Karelin — Contemporary (Born in 1967) (1967): Dominant Greco-Roman wrestler, nicknamed the "Russian Bear", celebrated for unmatched Olympic success.
• Benicio del Toro — Contemporary (Born in 1967) (1967): Esteemed Puerto Rican actor known for intense, versatile performances.
• Brian Schmidt — Contemporary (Born in 1967) (1967): Astrophysicist and Nobel Laureate known for research on accelerating universe expansion.
• Anne-Marie Duff — Shared historical date (10-08 · Born) (1970): Acclaimed British actress known for roles in Shameless and The Virgin Queen.
• Bruno Mars — Shared historical date (10-08 · Born) (1985): Pop icon known for retro showmanship and versatile songwriting.
• 5th Dalai Lama — Shared historical date (10-21 · Born) (1617): Spiritual and political unifier of Tibet, establishing the Ganden Phodrang.
• Alfred Nobel — Shared historical date (10-21 · Born) (1833): Pioneering chemist, inventor of dynamite, and founder of the Nobel Prizes.
• 1873 Historical Timeline & Archive — Explore world events and figures from 1873
• October 8 (10-08) On This Day — Historical birthdays and events on October 8
• 1967 Historical Timeline & Archive — Explore world events and figures from 1967
• October 21 (10-21) On This Day — Historical events and memorials on October 21