Hey Martin,

Thanks for that site. Excellent for a simple type like me. I bet I
could spend a week there just browsing!

Take care.

Brian Lawson,
Bothwell, Ontario.
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On Tue, 18 Jan 2005 06:51:25 GMT, "Martin H. Eastburn"
wrote:

Here is a good read :

http://hyperphysics.phy-astr.gsu.edu...rc.html#rotcon
Bottom of the page is a locus or balloon tree - right side -
select and hyperlink to the two - read and look at what it says.

Just the facts.

Martin