Main Page | See live article | Alphabetical index Ejnar Hertzsprung (October 8, 1873, Copenhagen - October 21, 1967, Roskilde) was a Danish chemist and astronomer. Along with Henry Norris Russell, he developed the Hertzsprung-Russell diagram (1910). Hertzsprung received the 1937 Bruce Medal.\n This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.