Johannes Franz Hartmann
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.
From *.wikipedia.org,
General Info
.
Male
Date of Birth
January 11st, 1865
Age
161
Birth Place
Germany, Thuringia
Date of Death
September 13rd, 1936
Died Aged
71
Star Sign
Capricorn
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