Johannes Franz Hartmann
(1865-1936)
Astronomer
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Johannes Franz Hartmann (January 11, 1865 – September 13, 1936) was a German physicist and astronomer. In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of interstellar medium.
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| Born |
11 January 1865 Erfurt, Saxony
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| Died |
13 September 1936 (aged 71) Göttingen
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| Zodiac | Capricorn |
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