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Enjar HertzsprungEnjar Hertzsprung was born on October 8, 1879 in Copenhagen, Denmark. Hertzsprung's father had already studied astronomy but could not get a job in that field, so he instead became a director of an insurance company. When Hertzsprung graduated from school, he studied chemistry at the school of Copenhagen Polytechnics. Then from 1898 to 1901, he worked at St. Petersburg in the technology of acetylene-lightning. During the summer of 1902, Hertzsprung began his chemistry studies in at W. Ostwald in Leipzig, but once his brother died, Hertzsprung returned to Copenhagen to live with his mother and sister. After his brother passed, he began to work as a private scientist and published books on stereo-photography and spectrophotometry, although these were not considered astronomy. He then went on to publish three more books between the years of 1905 to 1907. In the year of 1908, Hertzsprung met Schwarzchild, who proposed Hertzsprung as an extraordinary professor, a year later they both moved to the Potsdam Observatory. When Schwarzchild had traveled to the United States in 1910, he meet Henry Norris Russell. He had discovered in a discussion with him, that he had found out the exact same thing that Hertzsprung had came up with. So in 1911, Hertzsprung and Russell published their works in a geographical form. Hertzsprung later died in 1967 in Roskilde, Denmark. All of his works (12,153 pages with original measurements) was given to the United States Navel Observatory, where his former student, K. Aa. Strand was the director.
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