# Magnetic Dip and Magnetic Declination

## Magnetic Dip

The vertical angle between magnetic needle and earth surface is called angle of dip.

Magnetic Dip at equator is 0 degree.

Magnetic Dip at pole is 90 degree.

Dip is positive if needle points towards the ground.

Dip is negative if needle points away from the ground.

## Declination

The horizontal angle between magnetic meridian and true meridian is called declination.

Magnetic declination is positive towards east direction.

Magnetic declination is negative towards west direction.

## Isogonic line

The line connecting points with same magnetic declination is called isogonic line.

## Isoclinic line

The isogonic line with 0 magnetic declination is called isoclinic line.