a person in the record
Willem de Sitter
Dutch cosmologist (*1872 – †1934)1872 to 1934
Wikidata names Jacobus Kapteyn as doctoral advisor and lists 7 doctoral students. Linked to Wikidata, Mathematics Genealogy Project, and 5 other registers.

How to read the markscited by a repository's recordstated by Wikidata or indexed by OpenAlexclaimed on an ORCID list, or inferred
Advisors on Wikidata1
From Wikidata, shown separately from the thesis records.
- stated by Wikidata
Students on Wikidata7
From Wikidata, shown separately from the thesis records.
- stated by Wikidataborn 1890
- stated by Wikidataborn 1891
- stated by Wikidataborn 1896
- stated by Wikidataborn 1896
- stated by Wikidataborn 1902
- stated by Wikidata
- stated by Wikidata
The line above and below4 steps
The advisors of their advisors, four steps up at most, in the thesis records and on Wikidata, each kind marked; a person in both is listed once.
- 1 step up
stated by WikidataJacobus Kapteyn
- 2 steps up
stated by WikidataCornelius Hubertus Carolus Grinwis
- 3 steps up
stated by WikidataRichard van Rees
- 4 steps up
stated by WikidataGerard Moll
Below them, within 3 steps, the record reaches 27 people: 27 stated by Wikidata.
Theses
- stated by Wikidata
Discussion of Heliometer Observations of Jupiter's Satellites
doctoral thesis, stated by Wikidata
Education and career6
From Wikidata, shown separately from the thesis records. Each place opens its Wikidata item.
- 1885 to 1891studied
- 1891 to 1897studied
- 1897 to 1899
- until 1901studied
- 1901 to 1908worked
- 1908 to 1934worked