Jan Woltjer

Dutch astronomer (1891-1946)
Person human Q3272688
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Jan Woltjer

Summary

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

Key Facts

  • Jan Woltjer was born on August 3, 1891[2].
  • Jan Woltjer died on January 28, 1946[3].
  • Jan Woltjer's father was Jan Woltjer[7].
  • A child of Jan Woltjer was Lodewijk Woltjer[8].
  • Jan Woltjer held citizenship in Kingdom of the Netherlands[9].
  • Dutch was Jan Woltjer's native language[10].
  • Jan Woltjer's professions included astronomer[4].
  • Jan Woltjer's professions included university teacher[5].
  • Among Jan Woltjer's employers was Leiden University[11].
  • Jan Woltjer was employed by Leiden University[12].
  • Jan Woltjer was educated at Leiden University[13].
  • Jan Woltjer's doctoral advisor was Willem de Sitter[14].
  • Jan Woltjer is recorded as male[15].
  • Jan Woltjer's instance of is recorded as human[16].
  • Jan Woltjer's family name is recorded as Woltjer[17].
  • Jan Woltjer's given name is recorded as Jan[18].
  • Jan Woltjer's languages spoken, written or signed is recorded as Dutch[19].
  • Jan Woltjer's maintained by WikiProject is recorded as WikiProject Mathematics[20].

Body

Origins and Family

Jan Woltjer was born on August 3, 1891[2]. His father was he[7]. Dutch was his native language[10].

Education

Jan Woltjer was educated at Leiden University[13]. His doctoral advisor was Willem de Sitter[14].

Career and Affiliations

Recorded occupations include astronomer[4] and university teacher[5]. Employers include Leiden University[11], a university[21], in Netherlands[22], founded in 1575[23], headquartered in Leiden[24].

Personal Life

A child of Jan Woltjer was Lodewijk Woltjer[8].

Death and Burial

Jan Woltjer died on January 28, 1946[3].

Works and Contributions

Things named for Jan Woltjer include Woltjer[25], a lunar crater[26].

Why It Matters

Jan Woltjer has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[6] He is known by 13 alternative names across languages and contexts.[27]

Entities named for him include Woltjer[25], a lunar crater[26].

FAQs

Who were Jan Woltjer's parents?

Jan Woltjer's father was Jan Woltjer[7].

What did Jan Woltjer do for work?

Jan Woltjer worked as astronomer[4] and university teacher[5].

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. [15] . Leidse Hoogleraren. Retrieved . wikidata.org.
  2. [7] . wikidata.org.
  3. [9] . Leidse Hoogleraren. Retrieved . wikidata.org.
  4. [16] . wikidata.org.
  5. [8] . wikidata.org.
  6. [13] . Mathematics Genealogy Project. wikidata.org.
  7. [10] . wikidata.org.
  8. [4] . wikidata.org.
  9. [5] . Leidse Hoogleraren. Retrieved . wikidata.org.
  10. [11] . wikidata.org.
  11. [12] . Leidse Hoogleraren. Retrieved . wikidata.org.
  12. [14] . wikidata.org.
  13. [2] . Leidse Hoogleraren. Retrieved . wikidata.org.
  14. [3] . Leidse Hoogleraren. Retrieved . wikidata.org.
  15. [17] . wikidata.org.
  16. [18] . Leidse Hoogleraren. Retrieved . wikidata.org.
  17. [19] . wikidata.org.
  18. [20] . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [25] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [21] . Wikidata. wikidata.org. → on this site
  2. [22] . Wikidata. wikidata.org. → on this site
  3. [23] . Wikidata. wikidata.org. → on this site
  4. [24] . Wikidata. wikidata.org. → on this site
  5. [26] . Wikidata. wikidata.org. → on this site

Class ancestry

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

Aggregate / graph-position facts

  1. [6] . Wikidata sitelinks. wikidata.org.
  2. [27] . 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 April 10, 2026, from https://4ort.xyz/entity/jan-woltjer
MLA “Jan Woltjer.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 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: 2026-04-10}}
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 2026-04-10)

Canonical URL: https://4ort.xyz/entity/jan-woltjer · Last refreshed:

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. 15d 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.