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Deaths on December 28

Johannes Rydberg
1919Dec, 28

Johannes Rydberg

Johannes Rydberg, Swedish physicist and academic (b. 1854)
Johannes (Janne) Robert Rydberg (Swedish: [ˈrŷːdbærj]; 8 November 1854 – 28 December 1919) was a Swedish physicist mainly known for devising the Rydberg formula, in 1888, which is used to describe the wavelengths of photons (of visible light and other electromagnetic radiation) emitted by changes in the energy level of an electron in a hydrogen atom.

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Events on 1919

  • 5Jan

    Nazi Party

    The German Workers' Party, which would become the Nazi Party, is founded.
  • 23Mar

    Italian Fascism

    In Milan, Italy, Benito Mussolini founds his Fascist political movement.
  • 4May

    Treaty of Versailles

    May Fourth Movement: Student demonstrations take place in Tiananmen Square in Beijing, China, protesting the Treaty of Versailles, which transferred Chinese territory to Japan.
  • 19May

    Turkish War of Independence

    Mustafa Kemal Atatürk lands at Samsun on the Anatolian Black Sea coast, initiating what is later termed the Turkish War of Independence.
  • 29May

    General relativity

    Albert Einstein's theory of general relativity is tested (later confirmed) by Arthur Eddington and Andrew Claude de la Cherois Crommelin.