Titlebook: Willem de Sitter; Einstein‘s Friend an Jan Guichelaar Book 2018 Springer Nature Switzerland AG 2018 Einstein‘s cosmology.Cosmological model

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Descent: Patricians, Lawyers and Politicians, His father, also named Willem de Sitter, published in 1885 a genealogy of the De Sitter family. In this book the family tree was traced back to the beginning of the fourteenth century, to Flanders, now in Belgium. Roughly thirty years later a book from a different member of the family, Mr. J. H. de

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The Making of an Astronomer,) and to build an observatory on the southern part of the earth. John F. W. Herschel (1792–1871) was, although only 28 years of age, one of the founders of the Astronomical Society. Herschel was the son of the musician-astronomer William Herschel (1738–1822), who came from Hannover in Germany and wa

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The Road to Professor in Leiden,guage. Kapteyn’s father came from a true teachers’ family. The busy parents had not much attention for their own children. Kapteyn, ninth child of fifteen, suffered from this lack of attention. He made his first astronomical observations with a telescope, a present from his father. He was very talen

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,Fundamental Work and a New Theory of Jupiter’s Satellites,l force F. of two masses m. and m. on each other: F. = Gm.m./r., in which r is the mutual distance and G the gravitational constant (a mass twice as big gives twice the force, a double distance gives a quarter of the force). With the help of the tools provided by the celestial mechanics De Sitter wo

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At the Top,After his return from Arosa the emphasis of his work shifted to organization, administration and management. First there was the reorganization of the Observatory. After its successful completion De Sitter became secretary of the Senate of the University and the following year he was Rector of the U

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