An agonic line is a line on a chart or map showing points of zero magnetic declination.
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Line joining the points of equal variation is known as Iogonic line andthe line joining the points of zero variation is know as Agonic line.
An agonic point is o location where a magnetic needle points North without declination.
A shape with no angles or inclinations is called an 'agonic' which comes from the Greek language.
A line of best-fit.
A straight line, a telephone line, a shipping line, a fishing line.