Jacobus Kapteyn

1851 - 1922

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Prof Jacobus Cornelius Kapteyn FRS FRSE LLD (19 January 1851 – 18 June 1922) was a Dutch astronomer. He carried out extensive studies of the Milky Way. He found that the apparent movement of stars was not randomly distributed but had two preferential directions: the two star streams. Read more on Wikipedia

Since 2007, the English Wikipedia page of Jacobus Kapteyn has received more than 98,810 page views. His biography is available in 36 different languages on Wikipedia (up from 35 in 2019). Jacobus Kapteyn is the 180th most popular astronomer (down from 156th in 2019), the 324th most popular biography from Netherlands (down from 276th in 2019) and the 9th most popular Dutch Astronomer.

Memorability Metrics

  • 99k

    Page Views (PV)

  • 56.14

    Historical Popularity Index (HPI)

  • 36

    Languages Editions (L)

  • 8.07

    Effective Languages (L*)

  • 2.95

    Coefficient of Variation (CV)

Page views of Jacobus Kapteyns by language

Over the past year Jacobus Kapteyn has had the most page views in the with 11,983 views, followed by Dutch (2,581), and Chinese (2,466). In terms of yearly growth of page views the top 3 wikpedia editions are Cantonese (104.50%), Hebrew (82.54%), and Luxembourgish (77.87%)


Among astronomers, Jacobus Kapteyn ranks 180 out of 644Before him are Tobias Mayer, Gan De, Peter van de Kamp, Oskar Backlund, Maria Cunitz, and Margaret Burbidge. After him are Lyudmila Chernykh, Jean Chacornac, Seleucus of Seleucia, William Henry Pickering, N. R. Pogson, and Johann Hieronymus Schröter.

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Among people born in 1851, Jacobus Kapteyn ranks 37Before him are Edward Walter Maunder, Doc Holliday, Charles Dow, Princess Maria Antonietta of Bourbon-Two Sicilies, Angelo Moriondo, and Stephan Burián von Rajecz. After him are Jonas Basanavičius, Franz von Liszt, Désiré-Joseph Mercier, Jacques-Arsène d'Arsonval, Luis Ricardo Falero, and Alois Jirásek. Among people deceased in 1922, Jacobus Kapteyn ranks 51Before him are Paul Durand-Ruel, Princess Helena of Waldeck and Pyrmont, John William Godward, Pandita Ramabai, Stephan Burián von Rajecz, and Sidney Sonnino. After him are Eugen Ehrlich, Alexander Antonov, Louis Duchesne, Ali Kemal, Hüseyin Hilmi Pasha, and Heinrich Rubens.

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In Netherlands

Among people born in Netherlands, Jacobus Kapteyn ranks 324 out of 1,646Before him are Jacobus Oud (1890), Adriaen van de Velde (1636), Aert de Gelder (1645), Frans Timmermans (1961), Aad de Mos (1947), and Jan Dirksz Both (1618). After him are Karel Dujardin (1622), Emanuel de Witte (1617), Franciscus Donders (1818), Bartel Leendert van der Waerden (1903), Samuel Goudsmit (1902), and Willem van de Velde the Younger (1633).

Among ASTRONOMERS In Netherlands

Among astronomers born in Netherlands, Jacobus Kapteyn ranks 9Before him are Pieter van Musschenbroek (1692), Cornelis Johannes van Houten (1920), Tom Gehrels (1925), John Goodricke (1764), Antonie Pannekoek (1873), and Peter van de Kamp (1901). After him are Adriaan Blaauw (1914), Walter Lewin (1936), Michael van Langren (1598), Maarten Schmidt (1929), Eise Eisinga (1744), and Adriaan van Maanen (1884).