Springfield
Silver Member
mrs.oroblanco said:That is an absolutely impossible situation. Before 1903, no PRIEST, nor anyone else
knew about magnetic declination DRIFT.
...
I have never even seen a Jesuit Map that has a magnetic declination marked on it.
Beth
I hate to keep disagreeing with you Beth, but declination drift has been a known factor for as long as magnetic compasses of any accuracy have been in use. It's a simple observation. Here where I live, for example (N32.87, W108.22), the drift has been 2 degrees in only the past 30 years. That's a lateral error of nearly 200 feet in only a mile. And this is exactly WHY you've never seen a Jesuit map (or any other well-made chart) with a magnetic declination on it. An exception of course - the hallowed USGS Quad sheets show declination, but by the time the revisions are published, they are already inaccurate. CARDINAL COORDINATES ARE PERMANENT.
If we are to assume that the Peralta Stones are literally to be used as a map, then the intelligence needed to create them (after all, they remain undeciphered 50+ years after their introduction) was much farther advanced than needing to enter the observed magnetic declination on them. The '8-N-P' most likely relates to something entirely different. I guess all angles need to be considered (no pun intended), but continuing to try to pin '8-N-P' to magnetic declination seems like a good way to waste time.
By the way, here's a useful website: http://www.ngdc.noaa.gov/geomagmodels/struts/calcDeclination