Magnetic Compass—United States

To find the magnetic fields for Tucson (and other locations in the U.S.) see Magnetic Field Calculators, opens a new window.

Note: The magnetic fields changes with both location and date so this web site has a calculator base on location and date.

To use the calculator:

  • Enter your zip code (or country and city) in the Latitude/Longitude lookup. 
  • Click the Get & Add Lat/Lon button. The Calculate Declination form will self-fill. (Change the date field to see a different date.)
  • Click Calculate.
  • A pop up will show the declination.

Find the information you need by calling the library's Infoline at 520-791-4010 or by sending your question to Askalibrarian.