Author:Willem de Sitter
←Author Index: Si  Willem de Sitter (1872–1934) 
A Dutch mathematician, physicist and astronomer. 
Works[edit]
 On the bearing of the Principle of Relativity on Gravitational Astronomy (1911)
 A proof of the constancy of the velocity of light (1913)
 On the constancy of the velocity of light (1913)
 Space, time, and gravitation (1916)
 Einstein's theory of gravitation and its astronomical consequences. (1916)
 Einstein's theory of gravitation and its astronomical consequences. Second paper (1916)
 Einstein's theory of gravitation and its astronomical consequences. Third paper (1917)
 Planetary motion and the motion of the moon according to Einstein's theory (1917)
 On the relativity of rotation in Einstein's theory (1917)
 On the relativity of inertia. Remarks concerning Einstein's latest hypothesis (1917)
 On the curvature of space (1918)
 Further remarks on the solutions of the fieldequations of the Einstein's theory of gravitation (1920)
Some or all works by this author are in the public domain in the United States because they were published before January 1, 1923.
The author died in 1934, so works by this author are also in the public domain in countries and areas where the copyright term is the author's life plus 80 years or less. Works by this author may also be in the public domain in countries and areas with longer native copyright terms that apply the rule of the shorter term to foreign works.
