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Appendix A. CSAT3 Orientation
A.2 Online Magnetic Declination Calculator
The magnetic declination calculator web calculator published by NOAA’s
Geophysical Data Center is available at the following url
http://www.ngdc.noaa.gov/seg/geomag/jsp/struts/calcDeclination. After the
web page loads, enter the site zip code, or longitude and latitude, then click on
the “Compute Declination” button (FIGURE A-4).
FIGURE A-4. Online magnetic declination calculator with inputs and
output for Longmont, CO
The declination for Longmont, CO is 9.67 degrees (10 June 2006). As shown
in FIGURE A-4, the declination for Colorado is positive (east of north), so true
north for this site is 360 - 9.67, or 350.33 degrees. The annual change is -8
minutes/year or 8 minutes west per year.
A-3
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