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Re: magnetic variation calculator
From: Bill Murdoch
Date: 2005 Feb 24, 18:22 EST
From: Bill Murdoch
Date: 2005 Feb 24, 18:22 EST
In a message dated 2/20/05 6:00:43 P.M. Eastern Standard Time,
cfuhb-acdgw@EARTHLINK.NET writes:
At the U.S. National Geodetic Survey site I noticed they have a
magnetic declination calculator in their online "geodetic tool kit".
It's pretty interesting -- computes an estimate of your local
declination (variation)....
http://www.ngdc.noaa.gov/seg/geomag/magfield.shtml
I entered my location (35.0N 85.0W) the variation was -3.797 degrees.
I entered a point on my latitude but one degree father west (35.0N 86.0W) and
the variation was -3.797. On land I think I could measure the magnetic
azimuth of a setting star (or at lest one low in the sky) to
maybe 0.25 degree without too much trouble and determine my local
variation. That would give me my latitude to 20 minutes.
Does Harrison owe me a couple of pounds (with interest)?
Bill Murdoch