EXCELLENT answer Dave. You have the knack of explaining that I truly 
appreciate.  I knew my question was overly simplistic and the answer complex 
and different for varied locals.  You did a great job, thanks.

Regarding your assignment, yes that is a good way to visualize the angle. 
I've read paragraphs and seen drawings on just that subject.

Best Wishes in 2008,
Jerry







EXCELLENT answer Dave. You have the knack of explaining =
that I=20
truly appreciate.  I knew my question was overly simplistic and the =
answer=20
complex and different for varied locals.  You did a =
great=20
job, thanks.
 
Regarding your assignment, yes that is a good way to visualize the=20
angle.  I've read paragraphs and seen drawings on just that =
subject.
 
Best Wishes in 2008,
Jerry