Johannes Franz Hartmann
German astronomer (1865–1936)
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Updated 2026-06-16
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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- يوهانس فرانز هارتمانLow confidencewikipedia · ar.wikipedia.org
- جوهانس فرانز هارتمانLow confidencewikipedia · arz.wikipedia.org
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