a person in the record
Pieter Oosterhoff
Dutch astronomer1904 to 1978
Wikidata names Ejnar Hertzsprung as doctoral advisor and lists 5 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 Wikidata5
From Wikidata, shown separately from the thesis records.
- stated by Wikidataborn 1910
- stated by Wikidataborn 1927
- stated by Wikidataborn 1931
- stated by Wikidataborn 1936
- 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 WikidataEjnar Hertzsprung
- 2 steps up
stated by WikidataHans E. Laustated by WikidataKarl Schwarzschildstated by WikidataWilhelm Ostwald
- 3 steps up
stated by WikidataArthur von Oettingenstated by WikidataCarl Schmidtstated by WikidataHugo von Seeligerstated by WikidataThorvald N. Thiele
- 4 steps up
stated by WikidataFriedrich Wöhlerstated by WikidataHeinrich Louis d'Arreststated by WikidataJulius Vogelstated by WikidataJustus von Liebigstated by WikidataKarl Christian Bruhnsstated by WikidataLudwig Friedrich Kämtzstated by WikidataRudolf Wagner
Below them, within 3 steps, the record reaches 5 people: 5 stated by Wikidata.
Education and career6
From Wikidata, shown separately from the thesis records. Each place opens its Wikidata item.
- from 1945worked
- from 1948worked
- 1960 to 1961worked
- 1961 to 1972worked
- 1961 to 1972worked
- undatedstudied