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From: @S1-A.ARPA,@MIT-MC.ARPA:jennings@AEROSPACE.ARPA
Newsgroups: net.space
Subject: Relativity, re #247
Message-ID: <3549@mordor.UUCP>
Date: Tue, 17-Sep-85 21:02:29 EDT
Article-I.D.: mordor.3549
Posted: Tue Sep 17 21:02:29 1985
Date-Received: Thu, 19-Sep-85 05:19:00 EDT
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From: Richard K. Jennings 

	Re Steve Benz's proposal to lock onto color to determine relative velocity,
Two problems:

	Radial velocity is only one component of relative velocity -- it
	is not clear how angular velocity can be measure via colors;

	As the radial velocity approached the speed of light, the
	measurement instrument would have to become (in the limit)
	infinitely precise.

		-- Rich.