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Events that occur at the same time for one observer could occur at different times for another. The theory is special in that it only applies in the special case where the curvature of spacetime due to gravity is negligible. In order to include gravity, Einstein formulated general relativity in 1915.
Claudius Ptolemy, an Egyptian geographer, mathematician, and astronomer, is credited with the Ptolemaic Model of the solar system. His model posited not only that the Earth was the center of the entire universe and assumed that the planets all moved in epicycles--small circles--that also moved alongâ¦.