Hi CraigS,
You are right; I have been selective because I do not see agreement amongst the physicists. Perhaps I should have used relative velocity with the Earth's velocity relative to the Sun as 30 kps and relative to Sagitarrius A( as Renormalised Reminded me) as 250 +/-30. I don't have the expertise to take this any further, but there is a very good discussion on the subject on the net, reference below. I assure you I have learned quite a bit from our discussions.
http://www.sciforums.com/showthread.php?t=47515
www.sciforums.com/showthread.php?t=47515Cached - Similar
20 posts - 7 authors - Last post: 25 Jul 2005
Absolute Velocity - Meaningful but Useless Physics & Math.
Cheerio, Ernie.