Definition of agonic line in English:

Share this entry

agonic line

Pronunciation: /əˈɡɒnɪk/


An imaginary line round the earth passing through both the north pole and the north magnetic pole, at any point on which a compass needle points to true north.
Example sentences
  • Navigators on these so-called agonic lines do not need to make the usual correction to their compasses.
  • Extended lines that mark the constant magnetic declination away from the agonic line are called isogonic lines.
  • When using a compass east of the agonic line, the needle points in a direction that is west of true north.


Mid 19th century: from Greek agōnios, agōnos (from a- 'without' + gonia 'angle') + -ic.

For editors and proofreaders

Line breaks: agon¦ic line

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.