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This programs derives a table of secular change in magnetic declination for a specified point in the conterminous United States. It utilizes the USD polynomial & the IGRF spherical harmonic models. Declination is shown to the nearest minute so that secular change may be properly illustrated, but it is usually only accurate to within 30 minutes.

Zip Code:
Northern Latitude: Start Date:
Western Longitude: End Date:

The results will appear below.

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