Ejnar Hertzsprung, Danish astronomer

Ejnar Hertzsprung, Danish astronomer

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Ejnar Hertzsprung (1873-1967), Danish chemist and astronomer. Between 1911 and 1913 he developed the Hertzsprung-Russell diagram with Henry Norris Russell, which showed a correlation between spectral types and absolute magnitudes of stars. In 1913 Hertzsprung determined the distances to several Galactic Cepheid stars by statistical parallax - the measurement of an object's change in position against a background of stars, due to a change in observer position. From 1919 to 1946 he worked at Leiden Observatory, in the Netherlands, becoming director in 1937.

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