An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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magnetic declination
  واکیلش ِ مغناتیسی  
vâkileš-e meqnâtisi
Fr.: déclinaison magnétique  

In terrestrial magnetism, the difference between → true north (the axis around which the earth rotates) and magnetic north (the direction the needle of a compass will point,→ magnetic pole).

See also: → magnetic; → declination.