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Quotes from The Astronomical Aspect of the Theory of Relativity — Willem de Sitter

1872–1934 Netherlands

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The old Greek philosophy, which in Europe in the later middle ages was synonymous with the works of Aristotle, considered motion as a thing for which a cause must be found: a velocity required a force to produce and to maintain it. The great discovery of Galileo was that not velocity, but acceleration requires a force.

The Astronomical Aspect of the Theory of Relativity (1933)

Attribution

Quotes and notes from Wikiquote: Willem de Sitter (page history), available under CC BY-SA 4.0.