What is Simultaneity?

  • Relativity of Simultaneity is an implication of Einstein's special theory of relativity. Some, such as a professor of Physics and Finance named Espen Haug, regard it as "a cornerstone prediction in Einstein’s theory of special relativity."
  • Two events are simultaneous if they occur at the same time, in the same reference frame.
  • According to Knight, "Simultaneity is determined by when the events actually happen, not when they are seen or observed" (p. 1032).
  • The events may occur at different positions and still be simultaneous, as long as they are in the same reference frame.