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.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Who was born first?

• Johannes Franz Hartmann and Sofia Okunevska were born the same year
• Johannes Franz Hartmann and Jacques Hadamard were born the same year
• Johannes Franz Hartmann and Arthur Harden were born the same year
• Johannes Franz Hartmann and Nagaoka Hantarō were born the same year
• Johannes Franz Hartmann and Pierre Weiss were born the same year

Timeline

1. Arthur HardenOctober 12, 1865 – June 17, 1940
2. Jacques HadamardDecember 8, 1865 – October 17, 1963
3. Johannes Franz Hartmann (this page)January 11, 1865 – September 13, 1936
4. Nagaoka HantarōAugust 15, 1865 – December 11, 1950
5. Pierre WeissMarch 25, 1865 – October 24, 1940
6. Sofia OkunevskaMay 12, 1865 – February 24, 1926

Related

• Isaac NewtonDecember 25, 1642 – March 20, 1727
• Johann Wolfgang von GoetheAugust 28, 1749 – March 22, 1832
• Immanuel KantApril 22, 1724 – February 12, 1804
• René DescartesMarch 31, 1596 – February 11, 1650
• Marie CurieNovember 7, 1867 – July 4, 1934
• Nicolaus CopernicusFebruary 19, 1473 – May 24, 1543
• Louis PasteurDecember 27, 1822 – September 28, 1895
• Gottfried Wilhelm LeibnizJune 21, 1646 – November 14, 1716