From: utzoo!decvax!cca!KATZ@USC-ISIF@sri-unix Newsgroups: net.physics Title: time dilation and EM Article-I.D.: sri-unix.3000 Posted: Mon Aug 30 11:55:40 1982 Received: Wed Sep 8 01:55:58 1982 From: Alan R. KatzI don't have time to fully answer the question, but the doppler effects are the time dilation effect. There are two, the doppler effect if you are going away from an object, which also has a non-relativistic explaination, and the "transverse" doppler which was not know before relativity, which you get if you go "by" the object as opposed to directly towards or away from it. For further information, consult any lower division (freshman-sophmore) college physics text, it should have a pretty clear description (one that has a chapter on relativity in it). I seem to remember learning about it in the third semester physics for physicists and engineers. Sorry I can't be more complete but I don't have time to look it up right now. This is from old memories. Alan -------