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From: brooks@lll-crg.ARPA (Eugene D. Brooks III)
Newsgroups: net.physics
Subject: Re: Re: A Question on Time Dilation
Message-ID: <619@lll-crg.ARPA>
Date: Mon, 3-Jun-85 23:11:43 EDT
Article-I.D.: lll-crg.619
Posted: Mon Jun  3 23:11:43 1985
Date-Received: Thu, 6-Jun-85 10:04:47 EDT
References: <15000004@haddock.UUCP> <11210@brl-tgr.ARPA>
Organization: Lawrence Livermore Labs, CRG group
Lines: 11

> The only reason "c" is in the equation is to obtain natural
> units for space & time coordinates; the time dilation effect
> is not dependent on any communication by light, although such
> communication is often used in elementary texts to try to make
> the effect more intelligible.

The root from which all else was derived is the postulated constancy
of the speed of light in any reference frame.  Hence time dilatation
as Einstein derived it, and the only way it has been derived to my
knowledge please send references if I am wrong, is dependent on communication
by light.