22 Febuary

  • 1632 Galileo Galilei publishes his Dialogue Concerning the Two Chief World Systems, which compares the heliocentric Copernican model of the solar system with the traditional, Ptolemaic, geocentric one
  • 1857 Birth of Heinrich Hertz, who first demonstrated the existence of electromagnetic waves and after whom the unit of frequency is named
  • 1824 Birth of Pierre Janssen, the astronomer credited with discovering helium along with Joseph Norman Lockyer
  • 1902 Birth of Fritz Strassmann, known for his work that contributed to the discovery of nuclear fission
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