Relativity Derived Without Calculus -- Possibly Centuries Ago

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Galileo discovered Galilean relativity. He had the tools to allow himin theoryto discover Einsteinian relativity as well. (Original portrait of Galileo painted by Justus Sustermans in 1636.)
Galileo discovered “Galilean relativity.” He had the tools to allow him—in theory—to discover Einsteinian relativity, as well. (Original portrait of Galileo painted by Justus Sustermans in 1636.)

After Einstein developed his theories of special and general relativity, in 1905 and 1916, respectively, the world of physics changed dramatically. The theories, with their groundbreaking ideas on space and time, helped lead 20th century scientists to unlock the secrets of the atom and unleash the power of nuclear energy.


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