Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84 exptools; site ihlpg.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!ihnp4!ihlpg!tan
From: tan@ihlpg.UUCP (Bill Tanenbaum - AT&T Bell Labs - Naperville IL)
Newsgroups: net.physics
Subject: Re:  Light
Message-ID: <774@ihlpg.UUCP>
Date: Mon, 8-Jul-85 19:24:44 EDT
Article-I.D.: ihlpg.774
Posted: Mon Jul  8 19:24:44 1985
Date-Received: Tue, 9-Jul-85 07:07:09 EDT
References: <345@sri-arpa.ARPA> <778@inuxd.UUCP> <773@ihlpg.UUCP>
Organization: AT&T Bell Laboratories
Lines: 12

> You are incorrect in several respects.  The speed of light in vacuum IS
> constant, i. e. the same to all observers.  Light traveling from the earth
> to the moon is red-shifted due to the difference in gravitational potential,
> and light travelling from the earth to the moon is blue-shifted for the
				^^^^^^^^^^^^^^^^^
> same reason.  The travel times, however, are frequency independent (assuming
> transmission in vacuum) and the same in both directions.  General relativity
> does account for the frequency shifting.

Whoops. that should have been moon to the earth. Sorry.
-- 
Bill Tanenbaum - AT&T Bell Labs - Naperville IL  ihnp4!ihlpg!tan