BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• mathematics
• astronomy

Biography:
N/A

Residence

• Stockholm 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Foreign Member Afd. Natuurkunde 06-05-1885

Provenance

• Ledenlijst in: De leden van de Koninklijke Nederlandse Akademie van Wetenschappen. Een demografisch perspectief: 1808 tot 2008. Kaa, D.J. vam de, Roo, Y. de. KNAW Press (2008)

Publications

N/A

Wiki and VIAF

Wiki Data: Q250560
VIAF: http://viaf.org/viaf/64770631

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
After grammar school in Arnhem, Willem de Sitter went to Groningen to study mathematics However he did some experimental work for his physics curricula at the astronomical laboratory of the famous astronomer Jacobus C. Kapteyn. The latter was involved in measuring photographic plates from the Cape Observatory in South Africa, in collaboration with Sir David Gill to chart the southern skies. During a visit to Groningen Gill invited de Sitter to Cape Town, de Sitter accepted the invitation and decided to become an astronomer. He left in August of 1897 and among others worked on measurements of the four Galilean satellites of the planet Jupiter.
Towards the end of 1899 de Sitter returned to Groningen and obtained his Ph.D. degree there in 1901. The title was Discussion of Heliometer Observations of Jupiter's Satellites. In South Africa he also had met his wife Elanora Suermondt. The thesis, and in particular later work resulted in better orbits for these satellites, where also the mutual gravitational influences on each other s orbits were corrected on. This entailed new mathematical tools and approaches.
In 1908 de Sitter was appointed in Leiden as professor in theoretic astronomy and in 1918 he was appointed as director. Together with Kapteyn he reorganised the Observatory, where previously the work concentrated on fundamental observations of positions and motions of stars on the sky, the new observatory also concentrated from then on on astrophysics and theory. In spite of administrative duties, de Sitter still found time for studies on various aspects of astronomy and astrophysics. In particular his work on the General Theory of Relativity that Einstein had formulated, is universally known. He showed that the field equations that Einstein had formulated then very recently before also allowed a solution for the structure and evolution of the universe where it was expanding, contracting or oscillating. The first is now known to be the case. The most simple solution of the field equations for the expanding universe is called the Einstein-de Sitter Universe.
In 1919 de Sitter was operated for gallstones. However, the overdose of ether he was given resulted in a continuing poor health. Among others he suffered from tuberculosis, which made it necessary to spend two years in Arosa in Switzerland. He still succeeded in doing research and he arranged an agreement with the Union Observatory in Johannesburg, to jointly carry out observational studies. Also he took measures for two expeditions to Kenya to improve absolute positional measurements of stars on the sky. He received various important honors, among which the Gold Medal of the Royal Astronomical Society (1931) and the Bruce Medal of the Astronomical Society of the Pacific (1931). He was president of the International Astronomical Union from 1925 to 1928.

Residence

• Leiden 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Member Afd. Natuurkunde 15-05-1912
• International Astronomical Union
  President 1925 - 1928

Provenance

• Sitter, W. de, Proceedings 37, 1934, p. 734-737 door J. van der Hoeve.

Publications

• Outlines of a new theory of Jupiter's satellites Year: . Pages: 21. (PDF format)
  
• Outlines of a new theory of Jupiter's satellites. (continued) Year: . Pages: 10. (PDF format)
  
• On the orbital planes of Jupiter's satellites, as derived from measurements made at Berlin Year: . Pages: 7. (PDF format)
  
• Planetary motion and the motion of the moon according to Einstein's theory Year: . Pages: 16. (PDF format)
  
• Theory of Jupiter''s satellites. I. The intermediary orbit Year: . Pages: 9. (PDF format)
  
• On the relativity of rotation in Einstein's theory Year: . Pages: 7. (PDF format)
  
• On the figure of the planet Jupiter Year: . Pages: 5. (PDF format)
  
• On Absorption of Gravitation and the moon's longitude. Part I Year: . Pages: 18. (PDF format)
  
• On the orbital planes of Jupiter's satellites Year: . Pages: 15. (PDF format)
  
• Theory of Jupiter's satellites. II. The variations Year: . Pages: 7. (PDF format)
  

Wiki and VIAF

Wiki Data: Q313059
VIAF: http://viaf.org/viaf/190428276

View obituary (PDF format)

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Karlsruhe 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Foreign Member Afd. Natuurkunde 04-05-1874

Provenance

• Struve, O., Verslagen Natuurkunde 73, 1964, p. 24-25 door C.J. Gorter; Jaarboek 1963/64,p. 423-428 door A. Blaauw.

Publications

N/A

Wiki and VIAF

Wiki Data: Q58847
VIAF: http://viaf.org/viaf/10646413

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• mathematics
• astronomy

Biography:
N/A

Residence

• Stockholm 

Occupation

• Associate Professor 1794 - University of Uppsala, Uppsala
• Professor of Landsurveying 1806 - University of Uppsala, Uppsala
• Professor of Mathematics 1811 - University of Uppsala, Uppsala
• Vicar of Alunda Parish 

Education

• Student  - University of Uppsala

Membership

• Koninklijk Instituut, eerste klasse
  Correspondent, living abroad 19-10-1809
• Royal Swedish Academy of SciencesStockholm
  Member (Secretary: 1803-1811) 1798
• Royal Society of Sciences in UppsalaUppsala
  Member (Secratary: 1829) 1798
• Royal Swedish Academy of War SciencesStockholm
  Member 1802
• Royal Swedish Academy of Agriculture and ForestryStockholm
  Member 1815
• Franska InstitutetStockholm
  Member 1815
• Uppsala Swimming SocietyUppsala
  Founder/Member 1796

Provenance

• Svanberg, J.S., Jaarboek 1851, p. 127 door F.A.W. Miquel.

Publications

N/A

Wiki and VIAF

Wiki Data: Q4409938
VIAF: http://viaf.org/viaf/30319920

View obituary (PDF format)

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Cambridge 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Foreign Member Afd. Natuurkunde 18-05-1877

Provenance

• Ledenlijst in: De leden van de Koninklijke Nederlandse Akademie van Wetenschappen. Een demografisch perspectief: 1808 tot 2008. Kaa, D.J. vam de, Roo, Y. de. KNAW Press (2008)

Publications

N/A

Wiki and VIAF

Wiki Data: Q9095
VIAF: http://viaf.org/viaf/64037507

BIO

Dissertation: N/A

Highest degree: doctor

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Utrecht 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Member Afd. Natuurkunde 06-04-1855
• Nederlands Natuur- en Geneeskundig Congres
  Member [..1890]

Provenance

• Oudemans, J.A.C., Verslagen Natuurkunde 15, 1906/07, p. 459-464 door H.G. van de Sande Bakhuyzen.
• Ledenlijst Vereeniging het Nederl. Natuur- en Geneesk. Congres (1890).

Publications

• Mutual occultations and eclipses of the satellites of Jupiter in 1908 Year: . Pages: 34. (PDF format)
  
• A short account of the determination of the longitude of St. Denis (Island of Reunion) executed in 1874 Year: . Pages: 10. (PDF format)
  
• Over het onderzoek van verdeelde luchtbelbuizen Year: . Pages: 22. (PDF format)
  
• Determinations of latitude and azimuth, made in 1896-99 by Dr. A. PANNEKOEK and MR. POSTHUMUS MEYJES at Oirschot, Utrecht, Sambeek, Wolberg, Harikerberg, Sleen, Schoorl, Zierikzee, Terschelling (the lighthouse Brandaris), Ameland, Leeuwarden, Urk and Groningen Year: . Pages: 6. (PDF format)
  
• Supplement to the account of the determination of the longitude of St. Denis (Island of Reunion) executed in 1874, containing also a general account of the observation of the transit of Venus Year: . Pages: 18. (PDF format)
  
• Mutual occultations and eclipses of the satellites of Jupiter in 1908. Second part - eclipses Year: . Pages: 18. (PDF format)
  
• On the contents of the sixth and last part of the Report 'Die Triangulation von Java' Year: . Pages: 14. (PDF format)
  

Wiki and VIAF

Wiki Data: Q1366605
VIAF: http://viaf.org/viaf/242366885

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• mathematics
• astronomy

Biography:
Doctor in philosophy, physics and metaphysics. Professor at Utrecht University.

Residence

• Utrecht 
• Harderwijk 
• Harderwijk 
• Utrecht 

Occupation

• Professor Philosophy, Physics and Metaphysics 1783~, Utrecht

Education

N/A

Membership

• Bataafsch Genootschap der Proefondervindelijke Wijsbegeerte - Rotterdam
  Consultant 1790
• Koninklijk Instituut, eerste klasse
  Member 06-07-1809
• Hollandsche Maatschappij der Wetenschappen - Haarlem
  Member 1775
• Provinciaal Utrechtsch Genootschap van Kunsten en Wetenschappen
  Member (Corresponding member 28 June 1776) 01-04-1774
• Maatschappij der Nederlandsche Letterkunde - Leiden
  Member 1766 - [1788..
• Provinciaal Utrechtsch Genootschap van Kunsten en Wetenschappen
  Director 04-11-1779
• Natuur- en Geneeskundige Correspondentie Societeit in de Vereenigde Nederlanden - ’s HageUtrecht
  consulting member 1783

Provenance

• 'Naamlijst der H.H. Leden van de Algemeene Natuur en Geneeskundige Correspondentie-Societeit', in: Verhandelingen van de Natuur- en Geneeskundige Correspondentie-Societeit ('s Gravenhage 1783).
• Van der Aa, Deel 16, p.482

Publications

N/A

Wiki and VIAF

Wiki Data: Q1381480
VIAF: http://viaf.org/viaf/3204599

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• New Haven (Conn.) 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Correspondent Afdeling Natuurkunde 29-05-1951

Provenance

• Brouwer, D., Verslagen Natuurkunde 75, 1966 p. 32 door C.J. Gorter; Jaarboek 1966/67,p. 371-372 door H.C. van de Hulst.
• http://www.phys-astro.sonoma.edu/BruceMedalists/Brouwer/index.html
• https://www.newnetherlandinstitute.org/history-and-heritage/dutch_americans/dirk-brouwer/

Publications

N/A

Wiki and VIAF

Wiki Data: Q449935
VIAF: http://viaf.org/viaf/113021596

View obituary (PDF format)

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• mathematics
• cartography
• geometry
• astronomy

Biography:
Van Loon was a mathematician, astronomer and geometer. He called himself engraver and sea map maker. He also was writer of some books, which were published by Johannes van Keulen.
Van Loon made drawings for the Quadrans Astromomicus designed by Klaas Jansz. van Vooght (second half seventeenth century).

Collection: Universiteits Museum Utrecht (quadrant).

Residence

N/A

Occupation

• draughtsman 
• sea map maker 1675~

Education

N/A

Membership

N/A

Provenance

• Keulen, E.O. van. 'In de Gekroonde Lootsman' : het kaarten-, boekuitgevers en instrumentenmakershuis Van Keulen te Amsterdam 1680-1885 (Utrecht 1989).
• Mörzer Bruyns, W.F.J. The cross-staff : history and development of a navigational instrument (Amsterdam/Zutphen 1994).
• Mörzer Bruyns, W.F.J. Alphabetical list of Dutch instrument makers compiled by W.F.J. Mörzer Bruyns (Amsterdam 1986).

Publications

N/A

Wiki and VIAF

Wiki Data: Q31830836
VIAF: http://viaf.org/viaf/27367310

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Johannesburg 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Correspondent Afdeling Natuurkunde 25-05-1955

Provenance

• Bos, W.H. van den, Jaarboek 1975, p. 208-209 door J.H. Oort.

Publications

• The Orbit of Bu 6832 = Σ 1834 Year: . Pages: 6. (PDF format)
  

Wiki and VIAF

Wiki Data: Q2429387
VIAF: http://viaf.org/viaf/4684476

View obituary (PDF format)

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Utrecht 

Occupation

N/A

Education

N/A

Membership

• Koninklijk Instituut, eerste klasse
  Correspondent, living in the Netherlands / (resigned) 09-04-1847 - 26-10-1851

Provenance

• Ledenlijst in: De leden van de Koninklijke Nederlandse Akademie van Wetenschappen. Een demografisch perspectief: 1808 tot 2008. Kaa, D.J. vam de, Roo, Y. de. KNAW Press (2008)

Publications

N/A

Wiki and VIAF

Wiki Data: N/A
VIAF: http://viaf.org/viaf/286674055

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• mathematics
• astronomy

Biography:
N/A

Residence

• Amsterdam 

Occupation

N/A

Education

N/A

Membership

• Hollandsche Maatschappij der Wetenschappen - Haarlem
  Member 1752

Provenance

• https://de.wikipedia.org/wiki/Cornelis_Douwes
• Biografisch Woordenboek van Nederlandse Wiskundigen. http://www.bwnw.nl/

Publications

N/A

Wiki and VIAF

Wiki Data: N/A
VIAF: N/A

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy
• scientific instruments
• telescopes
• microscopes

Biography:
Very accomplished instrument maker. In 1663-1664, he developed a compound eyepiece that established him as the outstanding optician of the day. Developed a lens grinding machine and a silent night clock. Cassini made all of his discoveries with Campani telescopes.

Collection: Museum Boerhaave Leiden.

Residence

N/A

Occupation

• instrument maker 1700~, Rome

Education

N/A

Membership

N/A

Provenance

• Archive Museum Boerhaave

Publications

N/A

Wiki and VIAF

Wiki Data: Q3770213
VIAF: http://viaf.org/viaf/50097376

BIO

Dissertation: N/A

Highest degree: Ir.

Fields of interest:

• astronomy

Biography:
Conservator sterrenwacht te Leiden

Residence

N/A

Occupation

N/A

Education

N/A

Membership

• Nederlands Natuur- en Geneeskundig Congres
  Member [..1890]

Provenance

• "Familiebericht". "De Telegraaf". Amsterdam, 12-09-1951. Geraadpleegd op Delpher op 19-05-2016, http://resolver.kb.nl/resolve?urn=ddd:011140182:mpeg21:a0160
• Nieuwe Leidsche Courant | 10 september 1951 | pagina 3 (3/6) http://leiden.courant.nu/issue/NLC/1951-09-10/edition/null/page/3
• Ledenlijst Vereeniging het Nederl. Natuur- en Geneesk. Congres (1890).
• https://www.strw.leidenuniv.nl/outreach/strwarchief/GO_inventory.pdf
• De doos van Pandora / La boîte de Pandora, in "Studium 2 (2011) 127-132"
• http://www.stamboomonderzoek.com/jwvdhurk/getperson.php?personID=I35320&tree=jwvdhurk
• "BENOEMINGEN, enz.". "Arnhemsche courant". Regionaal/lokaal, 22-12-1888. Geraadpleegd op Delpher op 24-07-2017, http://resolver.kb.nl/resolve?urn=MMKB08:000089573:mpeg21:a0007
• "Binnenlandsche Berichten. DELFT, 30 Juni 1887. STATEN-GENERAAL. Eerste Kamer.". "Delftsche courant". Regionaal/lokaal, 01-07-1887. Geraadpleegd op Delpher op 24-07-2017, http://resolver.kb.nl/resolve?urn=MMKB08:000140318:mpeg21:a0003
• Leidsch Dagblad | 1951 | 14 september 1951 | pagina 9 URL: http://leiden.courant.nu/issue/LD/1951-09-14/edition/0/page/9
• Jaarverslagen en Jaarboeken Vereniging Haerlem | 2011 | 1 januari 2011 | pagina 131 URL: http://nha.courant.nu/issue/JJVH/2011-01-01/edition/null/page/131

Publications

• The 14-monthly period of the motion of the Pole of the earth from determinations of the azimuth of the meridian marks of the Leiden observatory from 1882-1896 Year: . Pages: 14. (PDF format)
  
• The investigation of the weights in equations according to the principle of the least squares Year: . Pages: 6. (PDF format)
  
• A new method of interpolation with compensation applied to the reduction of the corrections and the rates of the standardclock of the Observatory at Leyden. Hohwü 17, determined by the observations with the transitcircle in 1903 Year: . Pages: 23. (PDF format)
  
• Approximate formulae of a high degree of accuracy for the ratio of the triangles in the determination of an elliptic orbit from three observations. II Year: . Pages: 8. (PDF format)
  
• Calculations concerning the central line of the solar eclipse of April 17th 1912 in the Netherlands Year: . Pages: 17. (PDF format)
  
• Approximate formulae of a high degree of accuracy for the relations of the triangles in the determination of an elliptic orbit from three observations Year: . Pages: 9. (PDF format)
  
• On interpolation based on a supposed condition of minimum Year: . Pages: 11. (PDF format)
  

Wiki and VIAF

Wiki Data: N/A
VIAF: N/A

BIO

Dissertation: De mensura temporis (1781)

Highest degree: phd in theology and medicine

Fields of interest:

• mathematics
• physics
• astronomy

Biography:
Next to his career in science, he was also a politician in the Netherlands during the Batavian-French era 1796-1798. Member of the committee to determine sizes and weights (1808).

Residence

• Axel 1810 - 1831
• Middelburg 1795

Occupation

• professor 1782 - 1796 - Atheneum Illustre Middelburg, Middelburg
• politician 1796 - 1798
• s Lands astronomist 

Education

• student  - 01-09-1776 - Atheneum Illustre Middelburg, Middelburg
• student theology and philosophy 21-09-1776 - 12-12-1781 - Universiteit Leiden, Leiden
• student of medicine 09-07-1790 - 29-09-1790 - Universiteit Leiden, Leiden

Membership

• Koninklijk Instituut, eerste klasse
  Member 04-05-1808
• (Koninklijk) Zeeuwsch Genootschap der Wetenschappen
  Member 27-08-1782 - 1831
• Natuurkundig Gezelschap - Middelburg
  Member 1781 - 1795
• Gezelschap ter Beoeffening der proefondervindelijke Wijsbegeerte in ’s Hage
  Member 1803

Provenance

• Fokker, J.P., Algemene Vergadering Instituut 1832, p. 11 door J. de Vries; Verslagen Instituut Klasse I, 1831, p. 16 door J.P.E. Voute.
• Naamen der leden van het Gezelschap, ter beoeffening der proefondervindelijke wysbegeerte (Den Haag 1803).

Publications

N/A

Wiki and VIAF

Wiki Data: Q1870985
VIAF: http://viaf.org/viaf/71781815

View obituary (PDF format)

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Berkeley 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Foreign Member Afd. Natuurkunde 05-06-1950

Provenance

• Levensbericht O. Struve, in: Jaarboek, 1963-1964, Amsterdam, pp. 423-428

Publications

N/A

Wiki and VIAF

Wiki Data: Q367635
VIAF: http://viaf.org/viaf/27846447

View obituary (PDF format)

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Paris 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Foreign Member Afd. Natuurkunde 02-05-1894

Provenance

• Ledenlijst in: De leden van de Koninklijke Nederlandse Akademie van Wetenschappen. Een demografisch perspectief: 1808 tot 2008. Kaa, D.J. vam de, Roo, Y. de. KNAW Press (2008)

Publications

N/A

Wiki and VIAF

Wiki Data: Q29002
VIAF: http://viaf.org/viaf/237290664

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy
• meteorology
• mathematics

Biography:
He was a mathematician and astronomer, who was also active in politics. He became a honorary member of the society 'Felix Meritis'.

Residence

• Jutphaas 1830~
• Heemstede 
• Utrecht 1802~ - 1809~

Occupation

• member 1814 - 1818 - Provinciale Staten van Utrecht
• manager 1795 - Utrecht Observatory
• member (for the province of Utrecht) 1818 - 1830 - Tweede Kamer der Staten-Generaal
• member (for the Ridderschap) 1831 - 1836 - Provinciale Staten van Utrecht

Education

N/A

Membership

• Koninklijk Instituut
  Correspondent, living in the Netherlands 25-03-1809
• Hollandsche Maatschappij der Wetenschappen - Haarlem
  Member 1808
• Koninklijk Instituut
  Member 28-05-1816 - 1830~
• Provinciaal Utrechtsch Genootschap van Kunsten en Wetenschappen
  Ordinary member 3 dec 1798; Corresponding member 17dec 1798 1798
• Wiskundig Genootschap onder de zinspreuk ‘Een onvermoeide Arbeid komt alles te boven’ - Amsterdam
  member and honorary member 1802~ - 1830~

Provenance

• Biografisch Woordenboek van Nederlandse Wiskundigen. http://www.bwnw.nl/
• “Naamlijst der leden des genootschaps”, in: Wiskunstig mengelwerk (Amsterdam 1802).
• “Naamlijst der leden van het wiskundig genootschap”, in: Wiskunstige oefeningen (Amsterdam 1809).
• “Naamlijst der leden van het wiskundig genootschap”, in: Verzameling van wiskundige voorstellen (Amsterdam 1830).

Publications

N/A

Wiki and VIAF

Wiki Data: Q2430044
VIAF: http://viaf.org/viaf/74002454

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Newark 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Foreign Member Afd. Natuurkunde 11-05-1914

Provenance

• Ledenlijst in: De leden van de Koninklijke Nederlandse Akademie van Wetenschappen. Een demografisch perspectief: 1808 tot 2008. Kaa, D.J. vam de, Roo, Y. de. KNAW Press (2008)

Publications

N/A

Wiki and VIAF

Wiki Data: Q370136
VIAF: http://viaf.org/viaf/69692044

BIO

Dissertation: N/A

Highest degree: N/A

Fields of interest:

• astronomy

Biography:
N/A

Residence

• Tucson 

Occupation

N/A

Education

N/A

Membership

• Koninklijke Nederlandsche Akademie van Wetenschappen
  Correspondent Afdeling Natuurkunde 05-06-1950

Provenance

• Kuiper, G.P., Verslagen Natuurkunde 83, 1974, p. 6 door P.J. Gaillard; Jaarboek 1973,p. 203-205 door H.C. van de Hulst.

Publications

N/A

Wiki and VIAF

Wiki Data: Q192948
VIAF: http://viaf.org/viaf/110279401

View obituary (PDF format)