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What does an agonic line indicate?

  • A

    Places of equal easterly variation.

  • B

    Places where the value of magnetic dip is the same.

  • C

    Places of zero magnetic variation.

  • D

    Places of equal westerly variation.

Refer to figure.
An “agonic line” is a line on the Earth's surface along which the magnetic variation is zero. This means that the magnetic north and true north are aligned along this line.

An “isocline” (or isoclinic line) is a line on the Earth's surface that connects points on the Earth's surface where the magnetic dip (or inclination) is the same.

An “isogonal” is a line on the Earth's surface that connects points of equal magnetic variation. These lines help in understanding how the magnetic variation changes across different regions. The isogonals converge at both the magnetic poles and the true poles.

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