Willem de Sitter

Dutch cosmologist (*1872 – †1934)
Person human Q313059
Willem de Sitter
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Willem de Sitter

Summary

Willem de Sitter is a human[1]. His place of birth was Sneek[2]. He was born on +1872-05-06T00:00:00Z[3]. He passed away in Leiden[4]. He died on +1934-11-20T00:00:00Z[5]. He worked as an astronomer[6], mathematician[7], physicist[8], and university teacher[9]. He ranks in the top 0.72% of human entities by monthly Wikipedia readership (82 views/month, #7,236 of 1,000,298).[10]

Key Facts

  • Willem de Sitter was born in Sneek[2].
  • Willem de Sitter died in Leiden[4].
  • Willem de Sitter was born on +1872-05-06T00:00:00Z[3].
  • Willem de Sitter died on +1934-11-20T00:00:00Z[5].
  • Willem de Sitter is buried at Westerveld[11].
  • A child of Willem de Sitter was Aernout de Sitter[12].
  • A child of Willem de Sitter was Ulbo de Sitter[13].
  • Willem de Sitter held citizenship in Kingdom of the Netherlands[14].
  • Dutch was Willem de Sitter's native language[15].
  • Willem de Sitter worked as an astronomer[6].
  • Willem de Sitter's professions included mathematician[7].
  • Willem de Sitter's professions included physicist[8].
  • Willem de Sitter's professions included university teacher[9].
  • Willem de Sitter's field of work was astronomy[16].
  • Willem de Sitter held the position of rector magnificus of Leiden University[17].
  • Willem de Sitter was employed by University of Groningen[18].
  • Among Willem de Sitter's employers was Leiden University[19].
  • Willem de Sitter was employed by University of Groningen[20].
  • Willem de Sitter was educated at University of Groningen[21].
  • Willem de Sitter's doctoral advisor was Jacobus Kapteyn[22].
  • A notable work attributed to Willem de Sitter is dark matter[23].
  • Willem de Sitter received the Gold Medal of the Royal Astronomical Society[24].
  • Willem de Sitter received the Bruce Medal[25].
  • Willem de Sitter received the Prix Jules Janssen[26].
  • Willem de Sitter received the James Craig Watson Medal[27].

Body

Origins and Family

Willem de Sitter was born in Sneek[2]. He was born on +1872-05-06T00:00:00Z[3]. Dutch was his native language[15].

Education

Willem de Sitter was educated at University of Groningen[21]. His doctoral advisor was Jacobus Kapteyn[22].

Career and Affiliations

Recorded occupations include astronomer[6], mathematician[7], physicist[8], and university teacher[9]. Willem de Sitter's field of work was astronomy[16]. Employers include University of Groningen[18], a public research university[28], in Netherlands[29], founded in 1614[30], headquartered in Groningen[31] and Leiden University[19], a university[32], in Netherlands[33], founded in 1575[34], headquartered in Leiden[35]. He held the position of rector magnificus of Leiden University[17]. Doctoral students include Jan Woltjer[36], an astronomer[37], 1891–1946[38], of Kingdom of the Netherlands[39]; Willem Hendrik van den Bos[40], an astronomer[41], 1896–1974[42], of Kingdom of the Netherlands[43], specialised in astronomy[44]; Dirk Brouwer[45], an astronomer[46], 1902–1966[47], of Kingdom of the Netherlands[48], awarded the Gold Medal of the Royal Astronomical Society[49]; Simon Cornelis van Veen[50], a university teacher[51], 1896–1978[52], of Kingdom of the Netherlands[53], specialised in mathematics[54]; Coert Hendrik Hins[55]; and Pieter Kremer[56].

Works and Contributions

A notable work attributed to Willem de Sitter is dark matter[23]. Things named for him include de Sitter space[57]; de Sitter universe[58], a steady-state model[59]; Einstein–De Sitter universe[60], a model[61]; and De Sitter[62], an impact crater[63].

Recognition

Awards received include Gold Medal of the Royal Astronomical Society[24], a science award[64], in United Kingdom[65], founded in 1824[66]; Bruce Medal[25], an award[67], in United States[68], founded in 1898[69]; Prix Jules Janssen[26], a science award[70], in France[71], founded in 1897[72]; and James Craig Watson Medal[27], a science award[73], in United States[74].

Personal Life

Children include Aernout de Sitter[12], an astronomer[75], 1905–1944[76] and Ulbo de Sitter[13], a geologist[77], 1902–1980[78], of Kingdom of the Netherlands[79], awarded the Van Waterschoot Van Der Gracht Medal[80], specialised in structural geology[81].

Death and Burial

Willem de Sitter died on +1934-11-20T00:00:00Z[5]. He passed away in Leiden[4]. He is buried at Westerveld[11].

Why It Matters

Willem de Sitter ranks in the top 0.72% of human entities by monthly Wikipedia readership (82 views/month, #7,236 of 1,000,298).[10] He has Wikipedia articles in 23 language editions, a strong signal of global cultural recognition.[82] He is known by 25 alternative names across languages and contexts.[83]

Entities named for him include de Sitter space[57]; de Sitter universe[58], a steady-state model[59]; Einstein–De Sitter universe[60], a model[61]; and De Sitter[62], an impact crater[63].

His notable doctoral advisees include Dirk Brouwer[84], an astronomer[85], 1902–1966[86], of Kingdom of the Netherlands[87], awarded the Gold Medal of the Royal Astronomical Society[88]; Willem Hendrik van den Bos[89], an astronomer[90], 1896–1974[91], of Kingdom of the Netherlands[92], specialised in astronomy[93]; and Jan Woltjer[94], an astronomer[95], 1891–1946[96], of Kingdom of the Netherlands[97].

FAQs

Where was Willem de Sitter born?

Willem de Sitter's place of birth was Sneek[2].

Where did Willem de Sitter die?

Willem de Sitter died in Leiden[4].

What did Willem de Sitter do for work?

Willem de Sitter worked as astronomer[6], mathematician[7], physicist[8], and university teacher[9].

Where did Willem de Sitter go to school?

Willem de Sitter was educated at University of Groningen[21].

What awards did Willem de Sitter receive?

Honors received include Gold Medal of the Royal Astronomical Society[24], Bruce Medal[25], Prix Jules Janssen[26], and James Craig Watson Medal[27].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] . Catalogus Professorum Academiae Groninganae. Retrieved . wikidata.org.
  2. [4] . Catalogus Professorum Academiae Groninganae. Retrieved . wikidata.org.
  3. [14] . Leidse Hoogleraren. Retrieved . wikidata.org.
  4. [17] . wikidata.org.
  5. [12] . wikidata.org.
  6. [13] . wikidata.org.
  7. [21] . wikidata.org.
  8. [16] . wikidata.org.
  9. [15] . wikidata.org.
  10. [6] . Integrated Authority File. Retrieved . wikidata.org.
  11. [7] . wikidata.org.
  12. [8] . wikidata.org.
  13. [9] . Leidse Hoogleraren. Retrieved . wikidata.org.
  14. [18] . wikidata.org.
  15. [19] . Leidse Hoogleraren. Retrieved . wikidata.org.
  16. [20] . Catalogus Professorum Academiae Groninganae. Retrieved . wikidata.org.
  17. [11] . Google Books. books.google.cat. Provenance: wikidata.org.
  18. [24] . wikidata.org.
  19. [25] . phys-astro.sonoma.edu. phys-astro.sonoma.edu. Provenance: wikidata.org.
  20. [26] . wikidata.org.
  21. [27] . wikidata.org.
  22. [22] . wikidata.org.
  23. [36] . Mathematics Genealogy Project. wikidata.org.
  24. [40] . Mathematics Genealogy Project. Retrieved . genealogy.ams.org. Provenance: wikidata.org.
  25. [45] . Mathematics Genealogy Project. wikidata.org.
  26. [50] . Mathematics Genealogy Project. wikidata.org.
  27. [55] . Mathematics Genealogy Project. wikidata.org.
  28. [56] . Mathematics Genealogy Project. wikidata.org.
  29. [3] . BnF authorities. Retrieved . wikidata.org.
  30. [5] . BnF authorities. Retrieved . wikidata.org.
  31. [23] . wikidata.org.

Inverse relationships (entities pointing at this one)

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  6. [60] . wikidata.org. → on this site
  7. [62] . wikidata.org. → on this site

Inline context (facts about related entities)

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  55. [63] . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [10] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [82] . Wikidata sitelinks. wikidata.org.
  3. [83] . Wikidata aliases. wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Willem de Sitter. Retrieved April 10, 2026, from https://4ort.xyz/entity/willem-de-sitter
MLA “Willem de Sitter.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/willem-de-sitter.
BibTeX @misc{4ortxyz_willem-de-sitter_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Willem de Sitter}}, year = {2026}, url = {https://4ort.xyz/entity/willem-de-sitter}, note = {Accessed: 2026-04-10}}
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