Define magnetic elements of earth?
Elements of the earth’s magnetic field are:
1. Magnetic declination (θ): At a point on earth the magnetic meridian makes an angle with the geographic meridian. This angle is known as the magnetic declination or just declination.
2. Angle of dip (δ): It is the angle made by the direction of the earth’s total magnetic field with the horizontal direction.
3. Horizontal component of earth’s magnetic field (BH): It is the component of earth’s magnetic field along the horizontal direction.
So the angle of dip is the angle between earth’s magnetic field i.e. B and the horizontal component i.e. BH.
Hope, it helps you.