In
astrophysics
Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline said, Astrophysics "seeks to ascertain the nature of the h ...
, the term de Sitter effect (named after the Dutch physicist
Willem de Sitter) has been applied to two unrelated phenomena:
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De Sitter double star experiment
The de Sitter effect was described by Willem de Sitter in 1913 (as well as by Daniel Frost Comstock in 1910) and used to support the special theory of relativity against a competing 1908 emission theory by Walther Ritz that postulated a variable ...
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De Sitter precession – also known as ''geodetic precession'' or the ''geodetic effect''
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Astrophysics