Jan Woltjer

Dutch astronomer (1891-1946)
Person human Q3272688
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Summary

Jan Woltjer was born on August 3, 1891[1], in Amsterdam[2]. He died on January 28, 1946[3], in Leiden[4]. He worked as an astronomer[5] and university teacher[6]. He has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[7]

Key Facts

  • Father: Jan Woltjer[8]
  • Child: Lodewijk Woltjer[9]
  • Country of citizenship: Kingdom of the Netherlands[10]
  • Native language: Dutch[11]
  • Employer: Leiden University[12]
  • Educated at: Leiden University[13]
  • Doctoral advisor: Willem de Sitter[14]
  • Sex or gender: male[15]
  • Family name: Woltjer[16]
  • Given name: Jan[17]
  • Languages spoken, written or signed: Dutch[18]
  • Maintained by WikiProject: WikiProject Mathematics[19]

Body

Works and Contributions

Things named for Jan Woltjer include Woltjer[20], a lunar crater[21].

Why It Matters

Jan Woltjer is known by 18 alternative names across languages and contexts.[22]

Entities named for him include Woltjer[20], a lunar crater[21].

FAQs

Where was Jan Woltjer born?

Jan Woltjer's place of birth was Amsterdam[2].

Where did Jan Woltjer die?

Jan Woltjer passed away in Leiden[4].

Who were Jan Woltjer's parents?

Jan Woltjer's father was Jan Woltjer[8].

What did Jan Woltjer do for work?

Jan Woltjer worked as an astronomer[5] and university teacher[6].

Where did Jan Woltjer go to school?

Jan Woltjer was educated at Leiden University[13].

References

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

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [15] ↑ . Leidse Hoogleraren. Retrieved . wikidata.org.
  4. [8] ↑ . wikidata.org.
  5. [10] ↑ . Leidse Hoogleraren. Retrieved . wikidata.org.
  6. [9] ↑ . wikidata.org.
  7. [13] ↑ . Mathematics Genealogy Project. wikidata.org.
  8. [11] ↑ . wikidata.org.
  9. [5] ↑ . wikidata.org.
  10. [6] ↑ . Leidse Hoogleraren. Retrieved . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [1] ↑ . Leidse Hoogleraren. Retrieved . wikidata.org.
  14. [3] ↑ . Leidse Hoogleraren. Retrieved . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . Leidse Hoogleraren. Retrieved . wikidata.org.
  17. [18] ↑ . wikidata.org.
  18. [19] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [20] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [21] ↑ . Wikidata. wikidata.org. → on this site

Aggregate / graph-position facts

  1. [7] ↑ . Wikidata sitelinks. wikidata.org.
  2. [22] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

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). Jan Woltjer. Retrieved October 11, 2026, from https://4ort.xyz/entity/jan-woltjer
MLA “Jan Woltjer.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Oct. 2026, https://4ort.xyz/entity/jan-woltjer.
BibTeX @misc{4ortxyz_jan-woltjer_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Jan Woltjer}}, year = {2026}, url = {https://4ort.xyz/entity/jan-woltjer}, note = {Accessed: 2026-10-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Jan Woltjer — https://4ort.xyz/entity/jan-woltjer (retrieved 2026-10-11)

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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 14d ago · Printstream · 2026-09-29 view diff on Wikidata ↗
    Wikipedia languages → ['de', 'en', 'es', 'fr', 'ja', 'nl', 'zh']
    Place of death → Leiden
    Place of birth → Amsterdam
    Claims rich → —
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/56928|batch #56928]]: Import places of birth, death from dewiki"
  2. 21w ago · Lesko987a · 2026-05-18 view diff on Wikidata ↗
    Child → Lodewijk Woltjer
    Occupation → astronomer, university teacher
    Instance of → —
    Instance of → human
    + 16 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/32150|batch #32150]]: P2949 Update Qualifiers"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.