Willem de Sitter

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English: Willem de Sitter (6 May 1872 – 20 November 1934) was a Dutch mathematician, physicist and astronomer.
  • Willem de Sitter
    Willem de Sitter
  • Willem de Sitter (1872 – 1934)
    Willem de Sitter (1872 – 1934)
取自「https://commons.wikimedia.org/w/index.php?title=Willem_de_Sitter&oldid=197006425」