Willem de Sitter


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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. In other work he refined the orbits and masses of Jupiter's Galilean satellites, and showed the rotation of the Earth to be gradually slowing.

Subjects: Astronomy and Astrophysics.

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