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Quotation from Relativity: The Special and General Theory by Albert Einstein
“Every reference-body (co-ordinate system) has its own particular time; unless we are told the reference-body to which the statement of time refers, there is no meaning in a statement of the time of an event.”
Relativity: The Special and General Theory, Part I, Section IX, trans. Robert W. Lawson
The conclusion of the lightning thought experiment on the relativity of simultaneity.
Citation: "Every reference-body (co-ordinate system) has its own particular time; unless we are told the reference-body to which the statement of time refers, there is no meaning in a statement of the time of an event." — Albert Einstein, Relativity: The Special and General Theory, Part I, Section IX, trans. Robert W. Lawson. (id einstein-relativity-q3)
Portrait: Einstein 1921 by F Schmutzer - restoration, Ferdinand Schmutzer, Public domain.
