Sitter, Ulbo de

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Sitter, Ulbo de Gender: M
Lamoraal Ulbo de Sitter
born on 6 March 1902 at 17:30 (= 5:30 PM )
Place Groningen, Netherlands, 53n13, 6e34
Timezone LST m4e53 (is standard time)
Data source
BC/BR in hand
Rodden Rating AA
Collector: Astrodienst
Astrology data s_su.18.gif s_piscol.18.gif 15°13' s_mo.18.gif s_aqucol.18.gif 03°05 Asc.s_vircol.18.gif 14°37'


Dutch geologist from a noted family.

Lamoraal Ulbo de Sitter was born in a family of jurists. But he, his father Willem and brother Aernout were more interested in the exact sciences. As his father Willem de Sitter (and brother) already studied cosmology, Lamoraal Ulbo decided to study the Earth. His son Ulbo would become a noted sociologist, having as slogan "Kennis moet genomen worden" (Knowledge must be taken USK).

He dissertated in 1925 in Leiden with "Les porphyres luganais entre le lac de Lugano et le Valganna",

From 19 November 1948 till 19 February 1964 he was professor of geology in Leiden. His book Structural Geology (1956) became a classic.

He died 12 May 1980 in Nistelrode.

Link to Wikipedia



  • Other Family 5 April 1905 at 6:00 PM in Groningen (Brother born: Aernout de Sitter (astronomer))
    chart Placidus Equal_H.
  • Family : Change residence August 1908 (From Groningen to Leiden (father Willem became professor of astronomy))
    chart Placidus Equal_H.
  • Relationship : Marriage 12 April 1926 in Jönköping (Ingrid Clara Maria Frick)
    chart Placidus Equal_H.
  • Death of Father 20 November 1934 at 11:45 PM in Leiden (pneumonia)
    chart Placidus Equal_H.
  • Death of Sibling 16 September 1944 in Palembang (Aernout de Sitter, born 5 April 1905 6 PM, Groningen died as Japanese POW)
    chart Placidus Equal_H.
  • Social : Begin a program of study 17 July 1948 in Leiden (Appointed as Professor of geology in Leiden)
    chart Placidus Equal_H.
  • Work : Published/ Exhibited/ Released 19 November 1948 in Leiden (Inaugural speech: De veldgeoloog en zijn materie)
    chart Placidus Equal_H.
  • Death of Mother 20 November 1952 at 02:30 AM in Leiden (Eleonore Suermondt, born 16 November 1870, Surabaya)
    chart Placidus Equal_H.

Source Notes

Svi retrieved the BC from the municipal archive of Groningen: 6 March 1902 at 17:30.

Leidse hoogleraren - Sitter, Lamoraal Ulbo de


  • Family : Childhood : Family noted
  • Vocation : Education : Researcher (professor of geology in Leiden)
  • Vocation : Education : Teacher (professor of geology in Leiden)
  • Vocation : Science : Geology
  • Vocation : Writers : Textbook/ Non-fiction