# Author:Willem de Sitter

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←Author Index: Si | Willem de Sitter (1872–1934) |

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 field-equations 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, 1925.

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.