after Ejnar Hertzsprung †1967 Danish astronomer and Henry Norris Russell †1957 American astrophysicist
1939, in the meaning defined above
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“Hertzsprung-Russell diagram.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Hertzsprung-Russell%20diagram. Accessed 22 Sep. 2023.
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