Willem de Sitter Born: 6-May-1872 Birthplace: Sneek, Netherlands Died: 19-Nov-1934 Location of death: Leiden, Netherlands Cause of death: Pneumonia
Gender: Male Race or Ethnicity: White Sexual orientation: Straight Occupation: Astronomer, Mathematician Nationality: Netherlands Executive summary: Expanding space Astronomer Willem de Sitter calculated the size of the universe and studied dark matter, the satellites of Jupiter, and the rotation of the Earth. His theoretical work was groundbreaking, and his name is still heard in such terms of astrophysics as the de Sitter effect, de Sitter precession, and the n-dimensional de Sitter space. Responding to Albert Einstein's field equations of general relativity, de Sitter proposed that space itself is expanding independently of its matter, and eventually Einstein agreed. De Sitter's concept of expanding space, called a de Sitter universe, formed the basis of the Big Bang Theory. Father: Lamoraal Ulbo de Sitter (judge) Mother: Catharine Theodore Wilhelmine Bertling de Sitter Wife: Eleonora de Sitter-Suermondt Son: Aernout de Sitter (astronomer)
High School: Arnhem Gymnasium, Arnhem, Netherlands University: BS Astronomy, Groningen University (1897) University: PhD Astronomy, Groningen University (1901) Scholar: Astronomy, Royal Cape Observatory (1897-99) Teacher: Astronomy, Groningen University (1901-09) Professor: Astronomy, University of Leiden (1909-34) Administrator: Director of Leiden Observatory, University of Leiden (1919-34)
Royal Astronomical Society Gold Medal 1931 Bruce Medal 1931 James Craig Watson Medal 1929 International Astronomical Union President (1925-28) Lunar Crater De Sitter Crater Asteroid Namesake 1686 De Sitter
Author of books:
Kosmos (1932)
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