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He worked at the Cape Observatory in South Africa (1897–1899). Then, in 1908, de Sitter was appointed to the chair of astronomy at Leiden University. He was director of the Leiden Observatory from 1919 until his death. De Sitter made major contributions to the field of physical cosmology.
Willem de Sitter (born May 6, 1872, Sneek, Neth.—died Nov. 20, 1934, Leiden) was a Dutch mathematician, astronomer, and cosmologist who developed theoretical models of the universe based on Albert Einstein’s general theory of relativity.
Willem de Sitter was a Dutch mathematician, physicist, and astronomer who made major contributions in physical cosmology. View three larger pictures. Biography. Willem de Sitter's parents were Lamoraal Ulbo de Sitter and Catharine Theodore Wilhelmine Bertling.
Jun 7, 2024 · (1872–1934) Dutchmathematician and astronomer. He was an early supporter of the theory of relativity, assessing its implications for astronomy. From it he derived what is now called the de Sitter universe, the first theoretical model of an expanding Universe.
May 23, 2018 · In the fall of 1916 de Sitter discussed the theory with Einstein, and the discussions led Einstein to attempt to apply his theory to the universe at large. The result was Einstein’s closed or spherical model of 1917, incorporating the cosmological constant (Λ).
This is a thorough, very readable and excellently illustrated biography of Willem de Sitter (1872-1934), one of the most influential astronomers of his time, and also a co-author and correspondent of Einstein.
This is a thorough, very readable and excellently illustrated biography of Willem de Sitter (1872-1934), one of the most influential astronomers of his time, and also a co-author and...
Dutch mathematical astronomer Willem de Sitter gave his name to one of the first solutions to Albert Einstein's equations of general relativity, which showed that a universe containing very little matter would, in some sense, expand, and so prepared the way for Edwin Hubble's discovery of that expansion (though a different solution in fact ...
Willem de Sitter President of the International Astronomical Union from 1925 to 1928. His work gave rise to modern cosmology.
Dutch astronomer who developed a cosmological model in 1917 based on the assumptions of homogeneity and isotropy, the two assumptions of Einstein's model. His model assumed an expanding universe (in agreement with the Hubble law ), unlike Einstein's static model, and assumed that the matter density was zero.
