[Aztlan] Maya E groups

[Craig Berry]

On Wed, Feb 20, 2008 at 1:16 PM, David and Fiona Gray
<davefiona at yahoo.com> wrote:
> Some one mentioned that the accuracy of the alignment of the E groups decreased over time. I see the possible reason for this as being that magnetic north shifts over time .
[snip]

I would tend to doubt that.  The alignments were almost certainly
created by observation of sight lines to solstices from the planned
observation point.  A north-south reference line for the base of the E
could easily be surveyed relative to Polaris (though less and less so
as you go back several millenia, due to precession).  The necessary
alignments are so easy to obtain through direct observations that a
compass would be superfluous.

-- 
Craig Berry - http://www.cine.net/~cberry/
"So we struggle and we stagger, down the snakes and up the ladder, to
the tower where the blessed hours chime."
 - Leonard Cohen, "Closing Time"