Johannes Franz Hartmann
#31,059
Most Influential Person Across History
Astronomer
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Physics
#1064
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Astrophysics
#96
Historical Rank
Astronomy
#121
Historical Rank

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Physics
Why Is Johannes Franz Hartmann Influential?
(Suggest an Edit or Addition)According to Wikipedia, Johannes Franz Hartmann 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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What Schools Are Affiliated With Johannes Franz Hartmann?
Johannes Franz Hartmann is affiliated with the following schools: