<p>But for the record:</p>
<p>Two events that are siultaneous according to one observer will definitely NOT be simultaneous according to an observer in a moving reference frame. It is one of the strange things that follow when you accept that they DO agree about the speed of light.</p>
<p>There is a nice video explanation at </p>
<p>[Simultaneity</a> - Albert Einstein and the Theory of Relativity](<a href=“http://video.google.com/videoplay?docid=4820883104387202016]Simultaneity”>http://video.google.com/videoplay?docid=4820883104387202016)</p>
<p>(And yes, I know that this is not an SAT topic. But teaching physics is my day job and you have to admit, this is more interesting than the SAT!)</p>