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Johannes Franz Hartmann
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〔Asimov, ''Asimov's Biographical Encyclopedia of Science and Technology'' 2nd Revised edition〕
He was the director of the Observatorio Astronómico de La Plata from November 1922 to May 1934. He oriented the work of the observatory towards astrophysics. He discovered three asteroids.
His doctorate was from the University of Leipzig in 1891 on lunar eclipses.
==See also==
*Hartmann crater, on the far side of the moon
*Hartman mask, a tool to help focusing telescope
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