If we start from the north magnetic pole the agonic line takes us across Canada, the United States and South America in a fairly straight course to the south geographical pole.
To the east of the agonic line the declination is westerly, and to the west it is easterly.
The second agonic line which now lies to the west of St Petersburg appears in 1600 to have continued, after traversing Australia, in a nearly northerly direction through the extreme east of China.
To the east of the agonic line westerly declination is increasing, and to the west of the line, with the exception of a narrow strip immediately adjacent to it, easterly declination is increasing.
At present the agonicline passes in a south-easterly direction from Lake Superior to South Carolina.
At present the motion of the agonic line seems to be towards the west, but it is very slow.
These are termed agonic lines, but sailors often call them lines of no variation, the term variation having at one time been in common use in the sense of declination.
Since 1750 declination has always been westerly in the extreme east of the States, and always easterly in the extreme west, but the position of the agonic line has altered a good deal.
In 1600 the agonic line starting from the north magnetic pole, after finding its way south to the Gulf of Mexico, doubled back to the north-east, and passed across or near Iceland.
At all points in the United States and Canada east of the agonic line the declination is west, at points west of the agonic line the declination is east.
These two observations, one by Columbus and the other by Cabot, sufficed to determine the position of the agonic line, or line of no variation, for that locality and epoch.
These are called lines of no variation, or, as they have also been designated, agonic lines, and one is found in the eastern and the other in the western hemisphere.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "agonic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
