Is anyone aware of a shareware or freeware program available on the web that will compute the magnetic variation for various Longitude and Latitude coordinates? I am trying to orient my homemade dial and come up with slightly different variations depending on who I talk to. Anywhere from 9d W to 10.7d W. My coordinates are 39d N and 77d W. Is there a 'simple' or maybe not so simple formula that I could program an Excel spreadsheet to calculate. Thanks. --
Fiddler's Green We Design and Install Renewable Energy Systems "Solar Energy...Live the Good Life!" Greg Milsom, Owner PO Box 1200 Bowie, Maryland 20718 Phone/Fax: (301) 210-7669 http://www.radix.net/~green
